Sound — 9
I play mostly through a Marshall combo but also got an El-Cheapo rectifier combo. I also use it with headphones for nightly practice, simulating my amp -- it's not the real thing, but gets close enough. By itself it's not noisy, but all the buzz your guitar picks up gets amplified by overdriven settings. Unavoidable, but manageable. I'm very impressed by the quality of the wah. I like it better than my friend's actual wah pedal (can't remember which brand, not an unknown but not Dunlop). OD/DS pedals sound close to actual ones too. Loop recording/overdubbing is mono only, which is a shame, but it's good nevertheless.
Overall Impression — 10
I play anywhere from latin rock to Grunge, and from the Beatles to the Pixies, but I like to find my own tone, and I really like what the GT-10 does for me. I've been playing for 5 years now, with an Ibanez AXS32 (SG-like) and a stratoclone, and no matter what gear I play with, I always seem to get my personal tone out of it. It's been easier to get my tone out of the GT-10 than it was to get it from my Marshall MG250DFX alone. I don't use preset patches nor do I create my own ones because I love "manual mode". I feel as if I'd bought 40 stompboxes for the price of 10 or less. After using a DigiTech RP50 for a year... well, what can I say? It feels like you took your guitar and lowered its action by half an inch. To some people the POD X3 Live might sound better. However, the GT-10 matches my idea of multieffect pedals, and delivers the sound I want in the way I want.
Reliability & Durability — 10
If it needs a backup, you might as well gig with the backup. It's a brick, covered in sheet metal. It's heavy, and I'd only be afraid of kicking a knob and breaking it. The rocker pedal is nice and heavy, you have to really step on it to toggle it, and it definitely doesn't feel fragile at all.
Ease of Use — 9
This is not your ordinary fx box. You can use preset patches or customize your own, but the killer feature is the "manual mode", in which you turn your GT-10 into up to 8 separate stomp boxes + a wah/pitch bend/volume pedal. If you have many separate stomps, you might find this a good way to enter the world of multieffect pedals. If that's not your thing, well, patch edition is easy: you toggle stages by a button, you may rearrange them and the 4-way nav + dial is not always the most intuitive but rotating the dial is way easier than clicking a push-button a thousand times. Then there's the EZ mode, in which you can pretty much get near the tone you hear in your head without much of a hassle. The manual is informative, but you have to really play with the unit in order to realise all the possibilities.