I like the minimalist idea of this, but is it a gimmick or a decent bit of kit?

Lezyne Trigger Drive CO2

has anybody used one or something similar

cheers for any input given

Yeh I've got one, works fine once you do some practice runs. Just remember not to hold it with your bare hands.

practice runs?

Take it there's a knack to using them?

Well I wouldn't use something like that with at least one try first and Lezyne don't provide any instructions. The divice screws on to the valve, it's not a push fit as you may expect.

aye, my thoughts were that you'd fit the valve the screw the cartridge in or does the valve head rotate freely?

think i'll risk it

cheers

Yeh the valve head rotates, so you can screw the cartrdge on then screw the whole lot onto the valve – which is a lot easier if your fingers aren't stuck to it 😉