Quite agree. Got 'em on a few things TT, with the garish bit hoicked off and a bit o' stainless or ali sheet cut to suit. Pennies, compared to most other options (where you get what you pay for - maybe!). They don't leak and some of mine have been in place for years.
Can buy or make & mount a brass gauze filter tank-side - with a bit of plain pipe to create reserve on one side even. Inline external filter probably more convenient though, as clean-able without having to drain anything.
I use the larger versions for oil line taps, with a (reasonably) discreet fettle to earth out a mag or disable a coil.
Very practical for daily riders (but not for winning any shows). Horses for courses, as always. Me, I'll happily swap 'look' for 'leakproof'.
(In emergencies, a drilled-through brass BSP plug with a plain spigot soldered up the 'ole and a dirt-cheap inline tap from a lawnmower shop or whatever has got me out of trouble in the past . . . .)