+1 i have owned both and they only see 3 outings but there fun lolyeah - both tib8 and tpx can have remote line adaptors fitted to let you run from a tank rather than a sparklet.
IMHO the tpx was a better balanced, lighter feeling pistol.
i have owned both and sold both - they saw incredibly limited use and couldn't justify keeping them.
I was sorta hoping to use it as a main marker for some games. And yeah ive held the TPX before at NvS. I like itWhat do you want the pistol for - main marker or back up? I suggest you go to mcarterbrown.com , in the sidearms section there is a lot of discussion about which is better for which role.
If its for back up avoid remote lines, stick to the 12 grams, don't buy crossman ones.
In my opinion of the Tib and the TPX the Tib is the better marker but the grip is very fat on them so make sure it fits in your hand before buying.