I did mod them a little bit. They are both great amps right outta the box, but the C3 tubes are not the greatest.
I ran the 15W amp for about 100hrs right after I got it, then checked the bias (it was good) and tested all of the tubes. They all checked good. A year later, 2 of the 3 12AX7B's tested out out spec. The original EL84s were ok, but since I was replacing the other tubes, I replaced them also. I replaced V1 with a JJ 12AT7. V2 & V3 got replaced with JJ 12AX7As. V4 & V5 got replaced with a matched set of JJ EL84s. By that time the warranty had expired, so I replaced all of the high-voltage electrolytic caps before they failed. Some of them looked like counterfeit Rubycon caps because the logo was wrong. The only other thing I did to that amp was install a step attenuator between the amp & internal speaker so I could crank it at home without rattling the windows.
The 5W amp played well for maybe 50hrs, then V1 (12AX7B) got very noisy. Replaced it with a JJ. 20 or so hrs of operation later, the amp is dead. Blown fuse. Visual inspection revealed a blown ceramic cap in the HV supply. The cap was marked 1KV, so I know a line transient didn't kill it. I replaced all 3 ceramics in the HV supply and the fuse with good parts. While I was in there, I replaced the TONE pot with a C250K. It was B250K, but most of the action took place between 8 and 10. The way the TONE pot is wired, it's a treble cut for the bottom 90% of the rotation and a presence control for the top 10% of rotation. Changing to C taper fixed that, now it's closer to 50/50. It gets pretty loud thru the internal 8" speaker. I connected it to an external 15" and it was like it grew an extra set of balls!
I do recommend them, cuz they sound really good and are great bang for the buck. Just be prepared for the possibility of repairing them or returning them under warranty. Wait for them to go on sale, if that ever happens again.