The AVL first appeared in India in 1999. My understanding is that for the first few years they were highly cursed as having some basic problems. I started a topic under 'Tech tips' hoping that someone could give more details of what the early problems were, partly because I will be having two AVLs that came about three years after introduction. One problem, I think, was the push rods (or possibly the tappets), which may have been made out of an inferior metal, but I sort of garnered this from the India R E site and no details were given.
I suppose, therefore, that there will also be a question as to whether there also will be teething problems with the new UCE. I suppose it will be thoroughly tested so this won't be the case, but supposedly the AVL would have been thoroughly tested. Also there seems nothing really radical that might give trouble. But there is nothing like real driving conditions with a variety of owners with different styles of riding, maintenance etc. to give a final test.