I posted a few thoughts in the JH13 thread, I thought everybody on HC was reading that thread.
But seriously, I've been really pleased with my purchase. It took a while to receive the amp, because on the first shipment it arrived with a dead channel in a totally beat up box. David, the guy behind Acoustic Fun, handled everything very professionally, keeping constant communication and fixed things as fast as he could.
The amp construction is very solid from the outside and I dig its industrial look. I haven't opened it, but there are some pics of the internals on their website if you're interested.
I can't comment much further on the sound than what I already did in the JH13 thread, because frankly I haven't listened to that many amps in my life and I have no other amps right now to compare to. It shouldn't be hard to find Dynalo impressions here and on Head-fi though.
One thing I didn't mention is that apart from being used with the JH13, I also use the Dynalo as a preamp for my active 11L with the loop outputs. I haven't done serious A/B listening, but I could swear my speaker rig sounds better than it did previously when I controlled the volume using the Squeezebox digital volume, and I find it more convenient to turn a knob than having to use the remote.