Sound — 8
It hasan excellent clean feature. I've been using an Ibanez RG550 through it, yet there's pretty much no distortion. It buzzes occasionally, however that buzz is barley noticeable and isn't really distracting (unless you set everything very high. Then, it can really start buzzing, especially if the bass is high. However, it is good at what it does. Using the neck pickup creates a thick, nice, clean sound. Using the bridge pickup creates a "vintage" clean blues sound. The chorus is also fantastic, and sounds truly "natural".
Overall Impression — 7
The 15C is a very specific amp. It is very limited in features, and is not very verstaile. However, what it can do is amazing. If it was stolen, I might buy it again, as my other amp (a Fender Mustang 3), doesn't seem to the same good "sound" that this amp does. If you're into heavy metal, this amp prebably isn't for you (unless you pile on a bunch of effects). However, if you're into blues, or country, or just like a good chorus, then you would probably be happy with this amp. Overall, it's a solid amp.
Reliability & Durability — 8
I just recently dusted off this amp (which I haven't used to two years), and it still sounds amazing. The amp has also never broken down. If it had a little more watts, (it has 15), I would definetley use it for shows.
Features — 6
Since it technically is a beginner's amp, it's not exactly feature-heavy. 2 channels (while one uses a plug the I have no idea what goes in) with their volume controls, bass, middle, and treble. However, it also has a chorus button, which turns on the chorus, as well as a chorus speed adjustor. It lacks an overdrive. This makes very limited in what it can do in rock.