Anybody use True Bypass Effect looper pedals?

[rodeo_joel]

i kinda got interested in them when i was playing through my effects pedal board and found a noticeable difference in tone when i went DI, and then through the board. I thought about trying some kind of true bypass looper to eliminate this problem.

i was just wondering if anybody else used these? i've seen some pretty massive boards in my experiences, especially on this forum. seems to me that you'd lose a considerable amount of tone running a signal through a lot of pedals without having some kind of bypass looper.