I haven’t used the DS1 however I have used a number of other distortion pedals recently.

Firstly I think your choice of pedal should depend on the sort of sound you want. Some pedals will make you sound like a metaler and some will make you sound like Hendrix.

There are many different types of distortion pedals out there ! Plug it in at the shop and give it a good old testing.

Im using an Ibanez tube screamer at the moment (TS9DX) and I love it. I cant say that for other Ibanez pedals however the tube screamer is in my opinion a winner. I had one of the tone-lok (DS7) distortion pedals by Ibanez and it was so horrible I gave it away... Yach !

The Boss OS2 and MZ2 aren’t bad either. The MZ2 was a little lacking in terms of variety though this could be cured by placing a GE7 eq pedal either in front of it or behind it (very different sounds. If you already have a distortion pedal the trick with the EQ is worth checking out !!!

Hope these vague ramblings help
S