I have the Kemble Conservatoire with the silent system (which is a Yamaha silent system) - good job seeing as Yamaha now own Kemble fully! I bought the Kemble Silent Piano rather than the Yamaha as I preferred the tone (obviously a personal choice) - plus the Kemble's are/were cheaper than Yamahas
Regarding the Yamaha Silent System - I LOVE IT!!! It's great for silent practise with headphones rather than the muffler pedal I used to have. Recording yourself is easy and very beneficial so you can hear how you're really doing

I record my pupils and save their recordings onto my usb memory stick, then email them on. It's also great for recording duet work, as you can play along as if the other person is there (again I send the respective parts to my pupils so they can benefit from this too). It's lovely having the different instruments too, and I regularly use the harpishord voice when the pupils are working at Baroque music, so they can imagine how their music would have sounded.
I could talk forever, but in summing up - much better investment than nappies (I'd rather wash the old Terry type than give up my piano

).
Let me know if you need any more info!