Fliptop Boost is a winner so far. After a brief 15min experiment through headphones, placing it at a couple of different spots in the chain, running it at 9v and 18v, my favorite thus far is first in the chain at 18v. It seems to warm and tighten up the tone just a bit in all the right places. Feels a bit warmer and fuller at 18v than 9v, but that might be an auditory illusion. I seem to like most all of Josh's things better at 18 than 9v, for those that can take the voltage. And I like running it into the SVPre (among other things) way better than running the actual Fliptop into the SVPre. Makes the SVPre just a tad bit tighter and punchier. Running it after the SVPre was also sweet, and would probably be good to make the SVPre sound a bit edgier, as it seemed to open up the SV's tone a little bit, for lack of a better descriptor. It's a subtle, but delicious flavor enhancer.