I was looking for an overdrive/distortion pedal for solo tones and wanted to try a Jam Pedals product. So far this is the most expensive overdrive/distortion unit on my board and I have a feeling that it was worth it. And, of course, the packaging and the look of the pedal made an impression, it really felt that this is something special, a feeling you don't get from mass produced gear.
The only thing that's a bit odd are the input and output jack sockets, they are very tight, I's very hard to unplug the jack plugs, it takes a lot of force and makes you think that you might even damage the pedal by forcing the plugs out of the sockets. Maybe they could get less tight after some use, but I'm just keeping the patch cables inside the input/output of the Rattler that's connected to my pedal switcher and I have no reason to touch them. And anyways the Rattler has stayed on my board unmoved since I got it. I play it a lot.
I haven't tried original Proco Rat, modern or vintage, and my other drives are less gainy, so I cannot compare the tone of Rattler with a similar pedal, but I'm happy with the tones I get. It works well with my Marshall tube amp, as well as with Roland Jazz Chorus.
+ great tone
+ the looks
+ low noise floor for an distortion pedal
- tight input/output jack sockets