Matchbook is the newest of the betting exchanges and genuinely seeks to correct the liquidity problem that plagues Betdaq - on big matches anyway.
There is a lower commission rate of 1.1%, however, you'll pay this on both winning and losing bets, so take that into consideration.
On the bonus side, they offer sporadic sign-up bonuses (for instance, F25 gives you a £50 match bonus).
Even so, a useful book to have in case of outages of other exchanges.
http://goo.gl/a5lq48
There is a lower commission rate of 1.1%, however, you'll pay this on both winning and losing bets, so take that into consideration.
On the bonus side, they offer sporadic sign-up bonuses (for instance, F25 gives you a £50 match bonus).
Even so, a useful book to have in case of outages of other exchanges.
http://goo.gl/a5lq48