I've played the £70jp, we had it in the pub a while back now. It is usually about £5 a board, but it is fantastic fun, and the sound schemes on there are superb! In fact, I have a clone (near enough) of it, 'Bully for You' in my house.
The three Hi-Low is a bit of a gimmick, usually kicks you off on a 2 or 11 after a bonus.
Be sure to take your darts before the mystery part of the feature, as you can't then.
I seem to remember there being a lot of opportunities for the skill stop (using cancel button), especially useful on mystery. Usual things apply, if you hold the Hold Hi and Hold Lo during a bonus, it will supply a repeat chance.
Not a bad machine, better on a lower jp I would imagine. I think there is still one in one of the amusements in Gt.Yarmouth, played it a few months back.
Cheers
Toby