I find that strange as MBmodels have just added more spares and hop-ups for the new YZ4-SF.
3 pages of spares and enough to build a YZ4-SF with the spares. Some parts are more than one....
What I didn't like about XRAY was the spares and hop-ups are sold as single. So you buy 1 front wishbone 1 front C-hub etc....
Performance, cant see a lot in it. Quality, nothing in it. Just buy the one you like the look of. Both are nice buggies..........
My YZ4-SF was awesome yesterday........