Until recently I had both the Wonderlove and the GR2 (have not tried a GR1 but don't think they're that different, if at all)
I bought the WL on the strength of the GR2, which is just an utterly amazing piece of kit, and was disappointed with the WL to the point where I sold it last week. For me, even in low pass, the WL was nowhere near as deep/fat/juicy/funky/easy to dial in as the GR2 so it lost the fight. I wanted desperately to love it as much as I love the GR2 but in the end it just didn't work for me.
"Women and Rhythm Section First"
3Leaf Audio Club #71 l Team Trace Elliot #165 l The MXR Official Club #69