Yew V-cube is fine , but I had to replace my competition cube in this competition because the core is already wear down after 2 months -it popped and locked - Well a new core helps a lot . So you better have 2 V-cubes one only used for competition.
The V5 is definitely the best 5^3. It's no surprise times are getting better with it.
Mine is also 2 months old and still very good. Ton, you probably had no luck.
(And Jimmy has promised that someday he would learn COLL just for fun. )