Time RXE - Time has been producing floating pedals longer than anyone else and are currently the market leader, as well as being recommended by many sports injury professionals. Time's 10º of total float also have a recentering element to them which brings your foot back to the centre line. While this isn't free float, this amount of play can be enough to relieve the pressure.

Speedplay Zeros - The typical cleat and pedal set-up have switched here, so all you're left with is a lollypop protruding from each crank and a bulky cleat on the bottom of your shoe. There's a metal plate to protect the mechanism but this does make for a very slippery sole. With all 15 degrees of float fully open the pedals feel unstable to start with, like skitting around on ice, which doesn't give you a great sense of stability when putting the power down. However, you can adjust the float down to give exactly the amount of you need to feel stable and comfortable.

Shimano Floating cleat - The floating pedal idea has been turned on its head here, as it's not the pedal mechanism that moves but the cleat which floats instead. The benefit of this is you don't need to shell out on a new set of pedals to take advantage of this system, simply replace the cheaper consumable cleat. 

Bebops - Bebops are quite new to the UK and mirror the cleat and pedal style of the Speedplays. Specifically designed for an MTB or leisure shoe they do not connect with the 3-hole system on most road shoes. They also require that you cut away some of the shoe grip from the underside to fit them. Giving a massive 20º of float these pedals feel similar to the Speedplays for half the price, they also require virtually no maintanance.