I want to buy one but first I'd like to know...

Hi all, (first post)
I've gone through most of this web site and I'm on the verge of buying, I just need to confirm 2 things please.
Strictly hardware related.
Once I've built this device, is it REALLY as simple as pasting a Piezo capacitor onto a pad and then linking it to this system with a big jack or something? - All done with care and so on obviously - but what I mean is, there's no other converter or something that I will need is there? It's just this device, a couple of pads, and that's it? (once again - not talking about the software and PC side).
My second question is on speed and reliability.
I'm looking to use this for live performances so I really need to know from others out there that have built this... How many pads can play simultaneously without incident (loss / miss-hit / delay etc.)?
Let's say 3 snares were linked to the device and all 3 are drum rolled. Can it take it? Where does it start loosing the beat, so to say?
Many thanks.
I've gone through most of this web site and I'm on the verge of buying, I just need to confirm 2 things please.
Strictly hardware related.
Once I've built this device, is it REALLY as simple as pasting a Piezo capacitor onto a pad and then linking it to this system with a big jack or something? - All done with care and so on obviously - but what I mean is, there's no other converter or something that I will need is there? It's just this device, a couple of pads, and that's it? (once again - not talking about the software and PC side).
My second question is on speed and reliability.
I'm looking to use this for live performances so I really need to know from others out there that have built this... How many pads can play simultaneously without incident (loss / miss-hit / delay etc.)?
Let's say 3 snares were linked to the device and all 3 are drum rolled. Can it take it? Where does it start loosing the beat, so to say?
Many thanks.