I bought the Schertler David amp earlier this month and had the opportunity to use it last night while playing a restaurant gig. Although I have been practicing and working with the different settings before playing publicly, I waited to use the amp before submitting this post.
I play a Gitane 250m (with DYN-G, also has a big tone installed) and a Lowden F32c (with the DYN-G and the Fishman Matrix II pickup). The amp is beyond terrific. With the DYN-G, the sound is as natural an acoustic sound as I've ever heard; it's like having a mic in front of you, but to me, it's better. No feedback, buzzing, hissing, etc., just a very straight forward, clean sound. And the amp really delivers the sound. I thought about trying to boost the sound on the DYN-G, and if I had my preference I would, but even without it, the strength of the volume was fine. The warm setting for standard acoustic pickups is terrific. It cuts the brashness of the sound and gives the musician a lot of leeway in setting the eq.
I ran the amp into a sound board which drives the house speakers, focusing the amp at an angle toward the listening area, but at an angle to me as well. A friend told me he heard my amp over the house, not meaning volume, but that the clarity of the amp is really distinct. Also, I was told that there was a significant difference in sound clarity coming from my guitar in contrast to my buddy who was playing through a fender, i.e. my sound was very natural as if I just turned up the guitar's volume, as opposed to an "electric" sound coming from the fender. I am playing a very different music/style set next week and looking forward to working with this amp again. I've had a lot of amps the past year; Fender, Ultrasound, AER (which I really liked a lot), and a few others I borrowed, none of which matched up to the Schertler.
I bought the gig back with this amp; the amp weighs very little and is very easy to transport, a lot like the AER Compact 60, but seems just a little smaller. I really can't say enough good about it. If you're needing/wanting an amp for yourself, this is definitely one you owe yourself to check out.
Obviously, I'm really happy with this.
My 2 cents,