32red are widely regarded as one of the best online casinos, consitantly winning awards year after year for great customer service and loyalty bonuses.
I first joined with them in 2005 when they were relatively new, it is the only casino I have constantly deposited and played at for fun (not just bonus hunting) I have recieved hundreds in free chips after loosing streaks (which I then cashed out). Just this december I got £50 free despite not having played for several months, I then withdrew it for £240 and it was in my neteller account within 12 hours!!
As a club rougue member I get monthly deposit matches with very realisting wagering requirements, for example in January I got a 250 100% match and had to wager just 5000 (that makes a wagering requirement of just 10x deposit and bonus!!) and withdrew £450 for a £200 profit. 32red constantly excel my expectations with their great customer support, withdrawls are super fast and they will even turn of you 'reverse withdrawl' option if you wish.
32red also has other random bonuses throughout the year which many other casinos seem to over look, for example in December they increased their monthly bonus match for existing players as part of their christmas special.
32red have also rescently launched an online poker room and a sports betting site, you can utilise all these sites with 1 account which makes things a lot easier.
32red uses the Microgaming Viper software and occassionaly launches a few games which are totally unique to them, checkout the flash version for updates on this! Downloads of new games have certainly improved in download speed over the years, in 2004 it took me about 4 minutes from start to finished to download a new game, now it seems to take a matter of seconds. Download of the initial software is also very quick (especially if you are based in the UK)
32red are also sponsors of the Aston Villa football team! (oh well they can't be number one for everything!!)

All in all 32red is a solid company offering great services in all departments (casino, poker and sportsbook) if you are looking for a casino to play at regularly where you will be noticed by your casino host and offered great bonuses then look no further than 32red, I have yet to find any microgaming casino that can seriously compete with these guys