the SPD 30 is awesome. But having a TD15 I dont think you need the spd30 unless you need to expand. And yes, this will give you 8 extra pads(that you can assign 16 sounds to, AND you'll have the ability to run 4 more dual zoned external pads.
I think the only thing you'll be gaining with the spd 30 is the phrase looper(which is alot of fun and very creative) and you can really get very crazy with the bass/synth/piano etc sounds. I dont know if the 15 has all those sounds.
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