Nov. Dirtwheels they have 2 RZR articles.
1 on how to remove the spacer for higher top speed.

2nd is an article on trying new ITP wheel kits with offset rims for width.

In the article they mention the "weak rear A-arm mounts" and said the wider rims will most likely lead to structural damage. and that even in stock trim its only a matter of time.

Anyone have any issues yet?

if you take the spacer out of the clutch, you wil gain some top end, but the clutch may go overcenter and will not back shift properly. A tech guy at Polaris tells us that if you were going down a hill it may stick at high speed and cause a lack of control situation. end over end, possibly.
the suspension points are mildly built. they should take most abuse, but not strong enough for long travel in race mode. Check out the suspension thread for FST's kit. they have done their home work. Tory at FST knows his stuff.