I've used a Teese RCM3 with the Foxrox buffer for years. Works great with fuzzes. No problems.
I recently had a friend over and he brought his new RCM2 with the built in buffer. Sounded the same..both great.
The Foxrox has a trimmer you can adjust to get the right balance you want. I didn't open the new RCM2 so I'm not sure if it has a trimmer..but I assume so.
I've played a teese with the foxrox for so long, sorry I can't comment on others...I'm interested in hearing what else is even out there...
Come to think of it, I had an Ibanez WH-10 Wah that worked great with fuzzes...
If you dig the do it yourself approach the BYOC wah kit sounds fantastic and sports an output buffer that can be set up on a bypass switch. Plays well with Fuzz Face, MKII, and BMP fuzz circuits. I couldn't be happier with mine!