With the aerial tube mounted and the Cells on charge (1 amp with 3mv/cell cut off on my Eagle CDC 6.0b) I had a proper look at the Frog.
The spec of the car is quite high when you look at it. With some things only usually found on 10th scale race buggys. 

Ball Differential

Universal Joints with steel shafts.

Threaded adjustable camber links (not turnbuckles unfortunately)

Slipper clutch.                

Fully ball raced

The Frog also comes with 3 extra pinions for tuning the speed and some clip on pre-load adjusters for the 'shocks'.

I did some initial playing with the now fully charged cells installed in the car.  I cleared the kitchen floor of racing gear and raced the frog around the table like a maniac.  The tyres are fairly hard so traction wasn’t amazing but then nothing is super grippy on a laminate floor, so it wasn’t bad either and just meant it was more fun.  It was possible to slide the car with opposite lock on the steering.
Speed in the kitchen was great, I couldn’t use more if I had it. The car felt very much like a bigger 1/10th scale buggy with fairly quick steering and good throttle and brake.
The brakes kick in on the initial push of the trigger and are strong enough to pull the car round on a loose surface. The reverse can be activated by returning to neutral then pushing back again on the trigger, speed is about half that of forwards.

Next I went to my local 10th off road track, Batley, for a play over the jumps.  This was the first time running the car outside the kitchen and in all honesty it was disappointing.  The speed was poor and the steering was very quick with the car quite hard to keep in a straight line. 

On the fairly grippy astro the car would track straight and hit a small bump then shoot off at a random angle due to the poor spring suspension.  Very very small corrections on the steering also created exaggerated movements in the car, again shooting it off at an angle. It was hard to drive and harder to photograph.
I couldn’t quite estimate the speed of the car but it felt slow.  Indoors the car was great fun, but outdoors it seems to lack speed to the point of making it a bit boring.
The steering didn’t seem to self centre properly and needed steering input to track straight after turning the car in either direction.

The speed of the car meant getting any air time at all was a real challenge, I got a few photos which possibly due to their uninspiring nature I promptly lost from the card, so I cant show the car in action, oops.   Jumping the car over the jumps at batley resulted in occasionally getting the front wheels in the air and sometimes all four wheels at the same time, at least an inch high.  The car would then “land”, bounce around a bit, and shoot off at a funny angle.

The steering looks a bit of an odd arangement with the hub carriers leaning inwards and the hubs leaning out, maybe this odd setup is the cause of some of the overly keen steering that I experienced. The hub seems to lean over as it moves in the hub carrier which effects the Castor and / or Camber, or to put it another way the wheel remains almost vertical as it steers rather than leaning with the castor.

Speed is relative, a slow car on a tight track can be just as fun as a faster car on a bigger track.  But where the Frog was fun inside it was hard to limit myself to an area small enough to get some excitement out of the frog. I don't mean to make the car sound bad here, it was still mildly fun despite the poor performance. The speed can be improved slightly by fitting the largest pinion but this only made a small difference.

I had another look at the promotional video of the Mini Frog and some portions looked like mine, quite slow, while others were utterly misrepresentative with the car leaping many times its own length over huge jumps under full control.  Unless I had a poor example of the car, then the car used for half of the promotional video was certainly not the car you receive in the kit.
I asked Tamiya about this and couldn’t get a definitive answer but they concurred that the video did portray a “hopped up” frog in some portions (no kidding).  They also mentioned the car was made for a purpose, and I’d definately agree that in a confined space the standard car is great fun.  The option for more speed is there and is relatively cheap, just strap in a quicker motor.  Handling can be sorted with the addition of the hop-up shock absorbers.

To sum up, the car was great in a confined space but in a larger area the car looks like a toy and the handling wasn’t really up to scratch on anything but the smoothest ground. In all fairness, running the car on looser surfaces outdoors it didn’t snatch the steering quite so much and was a lot more controllable. But still, it was slow and slightly embarrassing in the big wide world. Still, I had a lot of fun with it.