Meh
The thing that annoyed me about Friends Reunited is the fact that when it started it was a pay only site. There was limited options to pay (IIRC it was credit card only online, or you could send a cheque).
By the time they made it free I'd lost interest (as so did a lot of people I wanted to contact). I'd say I've made contact with more of my old school friends on Facebook or just bumping into them in town than what I have done on Friends Reunited.
Rob