Yeah - the vintage rat is great... we play with noise a lot in my band (the Hydes), and on some songs I end up getting on the floor and playing with the knobs live, in conjunction with my Whammy - with my reverb cranked all the way up, i get some fantastic whale song feedback...
We're a 3 piece with 2 guitarists and a drummer (no bass), so I have to keep as much low end as possible in my tone. I keep the filter knob turned down all the way, and keep my guitar in the neck position with the tone knob set from 3-8. I play with a 80's Fender HM that I through some EMG 81's in (metal!).. which are really loud pickups... when I turn the distortion knob up all the way on the Rat I instantly get some great feedback to play with.
It's a fantastic pedal - very versatile. It's got a great Blues tone as well with the distortion and the filter set about 1/2 way up.