Hey man...
I have purchased both the Honda and the Yamaha - years 1989 and 1988 respectively - and although i have not started them yet, i have inspected the kits closely.
So i cannot tell you how they will go together, if they have fitment issues or inaccuracies, i can tell you they have a lot of parts and lots and lots of details. They both include alternate parts for the front suspension and front brakes. And front brakes ARE drilled.
The decals - especially the Honda for the Rothmans livery - are AMAZING.
So in my opinion they are most definitely worth a try, having also seen a couple of them built up in various modelling videos.
hope that helps