I currently have in my collection a few SP-10MK3, an NOS SP-10MK2A, DP-100, L-07D, PS-X9, TX-1000, TT-101, and an SL-1200 GAE and MK4. Oh, and a TD-224, just because I like the clockwork mechanics.
Most of them are in the refurb queue, and as such I haven't been able to hear them. Some aren't complete; I'm looking for a MAX-237 for the TX-1000. Actually, that's the only one that isn't complete.
I don't find the TT-101 electronics all that complicated, but the calibration procedures are a bit complex and the service manual, as they all do, gets some stuff wrong, and leaves some stuff out. The main board is beyond fragile which makes them a royal pain to work on. I've lost money on the few I've resurrected, and now won't even consider touching one for less than $1500. On the last one I had to repair a broken coil in the motor, and repair the main bearing, though that was inflicted damage.
Professionally I was a technology consultant up until a month ago, when I went full-time with my top customer. Since then my free time has been nearly non-existintent, and what little I've had I've spent on my own selfish pursuits. Plus it's summer, and I'd rather be on the lake on my wakeboard! :)