Sound — 8
I'm using the ds-1 with my crappy Yamaha erg 121 and Marshall MG10CD amp (also crap), so obviously it doesn't sound amazing. But for around 35 this pedal gives you a wide range of sounds from punk to a crunchy metal tone, and you can also get a damn good fuzz sound out of it. The only problem is that there's a lot of feedback when you turn up the distortion (but that's probably just down to my low quality pickups and amp).
Overall Impression — 8
This is a good (not brilliant, but definitely good) distortion pedal, which gives a wide range of tones and is very reliable. It is suited for playing almost any style of music (from light rock to metal), I love this pedal and through a good setup the DS-1 should be great.
Reliability & Durability — 10
I haven't had this pedal for long, but so far it hasn't failed me in any way, the battery lasts for ages. Also, my Boss DS-1 pedal has been bashed around quite a lot and is still working perfectly, so it's clearly a very tough and durable pedal. However, the battery that came with it when I bought was crap, so replace it with a good quality battery (9V I think) and it will last for ages.
Ease of Use — 9
Unless you do not know what a guitar is and have never heard of an effects pedal, you will find this pedal very easy to use, it just has selectors for distortion, tone and level, (and obviously the on/off pedal switch). The manual is helpful and gives some sample settings to get you started.