Cliffords can be problematic, but most is down to bad install, personally I'd go Toad, but your choice.
Whatever alarm system you get, the best bit of advice I can give is go to someone long established, preferrably with premises.
I had some alarms installed by a guy with "lifetime warranty", had a problem, phoned him up he said I'm at the airport going on hols for 3 weeks so can't look till I get back, then when he came back rang to say he's moved, and is now a builder in london, found out after he does a blitz for a few years here and there and scarpers if too many problems.
tabetha