I thought the 104 was a suppler ride than the Sirius.
Weight wise there wasn’t a great deal in it.
If I had the option again and both were the same price I would take the 104.
That said it was a little “quirky” …..
The rear disc routing on the XL requires a really long hose/cable. I ended up needing to swap out the factory hose on my Maguras for a longer one!
The gear routing is a little odd too. With anything but the supplest cable the cable rests on the fork crown which causes rub.
These are easily fixed but slightly frustrating especially given the frames RRP.
All in though they are a nice riding aesthetically pleasing frame.
If you need a 30.0 layback Thomson just say 😉