The Sonic Research Turbo Tuner has basically zero lag.
Yup, no lag on the Turbo Tuner. Strobostomp has a lag and an audible relay switching when you engage it.
Turbo Tuner would be interesting to me, but it doesn't have a buffer. I want my tuner to have a good buffer at the start of my board.
That said, I've read that the Strobostomp Mini has the same relay switching system, so it does have the same lag. Not a deal breaker for a lot of people, I know, but I'm used to instant switching.
I like this from factor is the hi quality buffer. It's seems you'll lose the buffer but gain some board real estate...
The Mini version does have the buffer and true bypass. Not sure if that's what you're saying.