I've got one conditioning (ESB) and one ready for bottling (Old Ale). Can't compare to Cooper's - never done one, but the sneaky tastes of the conditioning bottles (bottled 13th April) taste very good. I made these up for two reasons; 1. to avoid the munton's stick, 2. to avoid the LME 'twang'. The OG of the ESB was 1013 and the Old Ale 1014 - so happy with that. I used choice 2 - spray malt. One observation is that with the spray malt they're not quite so full-bodied as two cans of LME, however I don't consider that a drawback, they definitely don't have any 'twang' associated with them.
Personally I'm more than happy to carry on with them - in fact I have another one on order at my LHBS at the moment.
Another thing, they're good fun to make! Steeping the hops and grains seems almost like doing an extract brew!

I'd give them a go Brysie, I'm sure you'll like them...