Jennifer got a groupon for us to go try K1 Speed Indoor Go Kart Racing in Santa Clara. Turns out it's a stone's throw from where Speedring used to be before it closed.
What's special about this place is that all the karts are electric.
So, what I thought about the place:
unfortunately, they use lead acid batteries, so they don't have the power to weight ratio I was hoping for. They were fast enough, but not as fast as other indoors gas karts I've driven.
the lack of noise is actually not bad, and the lack of fumes is good :)
they have 3 rows of cars and 2 charge while the 3rd one is used. That's not so bad.
the track layout is a bit basic (easy-ish), but eh, it's still fun enough to drive.
the kart max speed is remotely controlled. This is used to force you to do a slow lap and come back in slowly or stop everyone to walking pace if there was an accident. It's a bit spooky but I guess that makes sense.
karts have a reverse gear, that's cool since they help you get out of a tight spot without external help.
All in all it was different but still fun :)
Jennifer is still lacking a bit of the aggressive spirit necessary to push people around who are blocking you, and making a spot where there isn't one, but her fastest clean lap wasn't that much slower than mine. She did well :)