Yes, yes, and yes! Lots of people have fitted them, they make a very noticeable improvement, and they are dead easy to fit.
Absolutely: they made a noticeable difference to Aldermog the Roadster. and I don't understand why MMC doesn't fit them as standard to the +4 and the Roadster.
Of course the Plus 8 deals with brake reaction using modern wishbones and big forged fittings!