I upgraded a 2019 Fox 34 Fit4 to the v1 Lift. It dropped right in with no issues during a lowers service - no crush washer necessary. I've been putting it through the ringer in New England jank for a couple of months now. The results are phenomenal, no more hand spikes, and a firm, supportive platform that just works great once dialed in to you. It rides high during climbs and just gets out of the way when smashing rocks. I wouldn't hesitate to recommend this upgrade to anyone looking for better performance from their fork.
At 200lb I started with the green tune on a 140/120 trail bike, then swapped to the blue compression tune since the shorter travel fork has to do more work with less travel. The green rebound stayed in for extra pop.
I think MRP did a fantastic job, and the v2 looks to be even better. Being able to custom tune a shock from your home garage is a real game-changer! This is a major upgrade for anyone changing out a Fit4, Grip1, Grip2, or GripX damper. And far less harsh and fiddly than the GripX2 on my Fox 40, if only there was one that fit there too... sigh...