It works quite well with 18650's and 18490's. It takes 2 spacers per battery for the 18490's so I'm guessing that it will take 3 spacers per battery with the 18350's. I have very little experience with any other chargers but I'm quite pleased with this one.
Edited to add that you can buy additional spacers for just 45 cents each as I recall.
I use two spacers in my WR-139. Don't need spacers in the WF-188. Cheapest way to go if you are doing 3.7 IMR, or protected (or unprotected Powerizers that NotCigs sells for the BP). If you have 3v LiFEPO4 then you should already have the appropriate charger. The only reason I have the 3v LiFEPO4 was for use in stacking unregulated. I use the 3v and the skinnier 16xxx batteries because I have them already. They work great but if buying new, for the VV REO, best to get the AW IMR 18xxxx.
Hugs, Feisty Alice