Finally found a thread I can contribute to other than Aliso/Laguna trail advocacy thread.
I bought a Wiz around late '17/early '18. It was an excellent investment for me. I've used it to help setup (2) Float X2's, (1) DPX2, 150mm Pike, various Fox 36's (170mm & 180mm) RC2's and recently a 170mm GRIP2. I used to leave it on for a few weeks after getting my settings established. By doing this it's helped me get a better understanding of the Shock Wiz's recommendations and how they change by trail type and speed.
Some things I learned/observed that may be useful for others:
- Setting recommendations are going vary somewhat from trail to trail; e.g. the Luge will have different settings than steeper trails with harder compressions (some of the trails in Aliso/Laguna)
- Recommendations do sometimes change slightly on the same trail if one's speed varies from run to run, mostly limited to HSC and LSC
- Rebound settings never change once is established, the only exception if I'm experimenting with riding style on how I weight the bike
- The recommendations are only recommendations. It's a machine, it doesn't think, so experiment, don't feel tied to do everything the it says if you have a reason why or even just want to experiment. Example I had instance where it recommended that I remove a spacer from my X2. After doing this and continuing to tune the shock/bike felt wallowy in the mid-stroke. I added the spacer back and started adjusting based on the other recommendations and the removing spacer recommendation went away a couple of rides later as the other settings got worked out. The shock now feels great and has no wallowing.
- For SoCal conditions I've found Fox psi settings way too high and prefer to run a much lower psi with 3-4 volume spacers. This provides good small bump sensitivity when the trails are dry and get the mix of hard-pack covered in marbles/silt and also some nice progression for the steeper trails, harder hits, etc.
- Edit/addition: once you have a setup that you like take the time to save your settings in either the app or somewhere that you can find/use at a later date, it's really quite useful months later
- As far as GRIP2 specific settings I recommend using the psi, compression, and rebound settings from Pivot as a (very good) starting point. (Credit the GRIP2 thread on MTBR.) These settings rated 92 with 100% confidence on the Wiz. The only change I've made is to add about 5psi over Pivot's guide. I might eventually add 1-2 clicks of HSC & LSC but the fork feels excellent right now.
All in all it's not a necessary device, but it's definitely a nice to have. Sure you can get your suspension setup without it, but it helps you get there a lot faster and these days ride time is precious (and limited) to me. If you like to tinker then it's just an added tool and you can have fun seeing how the recommendations change when you change what type of tune you would like (e.g. playful, planted, firm). Hopefully this provides some value.
Who has used a shockwiz with success and who has one I can rent/borrow from them? Even though I have a solid base setting on my 36 grip2 I'd still be curious to see what the shockwiz has to say about it 
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I have my settings in apple notes so if the wiz isn't so wizzy after all I can revert back.
