sonicfrontiers pre-amps reliable or not?

I can't speak to the reliability of the newest stuff, but I owned and SFL-1 which I purchased used for over three years and it performed flawlessly. And, believe you me, it got A LOT of use. My wife stays at home and would often leave music on ALL day long. It probably averaged over 5 hours of daily use. Maybe 6000 hours of use during my time with the piece.

I bought a used SFL-3 and never had any problems with reliability.

I have had an Sonic Fronteers Antheum AVM-2 for about a year. It has performed flawlesly.

Line 3 works fabulously, sounds even better. 3 years now and lots of hours! reliable...good luck in your decision