So I've got a set of KW V3's on their way and until now hadn't given a thought as to whether or not my current wheel and tire setup will have clearance issues.
 
I know a couple of guys are running these coilovers, how has the clearance been for your wheel and tire setups? I'm running 18 X 7.5+35 with 225/35 tires up front and 18 X 8.5+38 with 255/35 tires in the rear. Reckon they'll fit?
 
 

I would say yes.

Good news :) have you had experience with these particular coilovers yourself?

Nope, but coilovers in general. And I've had 17x8 +38 front (225 tyres) and 18x9.5 +42 rear fitted (275)
 
I'll estimate that you'll have 5-10mm between the front tyre and your coilovers.

I have KW V3s. Your rears will be OK by a mile. Your fronts will probably be OK, maybe with minimal clearance, but OK nonetheless.