Assembling itself takes about half an hour. Depending on your tele design, you might need to carve about 0,5 cm space on the side underneath a control plate for the battery & its cable to fit in. I'm a noob for electronics and I've installed the T-system on my favorite japanese tele with messed up electronics, thinking what could go wrong.
Nothing went wrong.
Besides, I play left handed. So everything works flawlessly upside-down.
Once you're done setting the bridge back, re-stringing and adjusting the pickup height, pay attention to how articulate your instrument becomes.
Plus, it's noiseless and dead quiet altogether. Ready for gigging in all the funny places or recording in front of your favorite amp sim.
Whoever says active pickups (and these are my first, btw) lack character is probably a characterless player himself.
+ support at Thomann is top notch.