Re: Should I buy...
I have a PTX-8 which is the rack version with trigger inputs, no hihats though...mmm...I should hook the 707 separate outs to the trigger ins.
You can really modify the sounds much more than something like a TR-626. The pitch bend envelope was fun, and you can get some deep bass. I have the cart with the dodgy vocal samples (WRC-02??). The carts are way overpriced.
I'd say get an RX-5/7 or PTX-8 if you can get it cheap, but it's no 707, DX/DMX etc.