WR,
when you fit the Bobs knobs, I found with mine that the wider (Bobs) knob didn't allow me to securely insert the DC 12v connector for the fan - the female 12v connector was positioned really close to one of the original mirror adjustment screws. So I had to relocate that which was a bit of a pain. But the Bobs Knobs do make both mirror adjustments really easy.
The stronger primary mirror springs are pretty much mandatory for the 12" too.
Other than that I've added a counterweight so that I can use heavy EPS etc, a shroud which improved the image, and I have a dob trolley coming soon. After that, just the AN to buy and then I'm fully sorted
Cheers,