only the guys from PN Racing & Atomic could give reliable, hard statistics for Mini Z's popularity. we focus on the most recent entry to the micro market, the 1/43rd scale dNano. i read somewhere in this thread that micros have a more promising future in sales & popularity due to their comparitively low cost and convenience factor (indoor) - or something of that nature - and i'll have to agree 110%. every scale started from ZERO and the way the world economy is going only benefits micro.
i've been in touch with one of your reps because we (our parent company) distribute for X-Power - so of course i've heard of BERT