I did my training in Florida in 2009. Back then I saved over £1500 which also considers the cost of accommodation and flight. I rattled it out in a little over 3 weeks.
The only drawbacks were that I spent a bit of time learning the airspace when I got home (not hard) and the RT is a bit different. But hey, I saved £1500 so that money went towards familiarisation and a few more hours meaning that I got more hours, more experience and had a blast all for the same cost as learning to fly in the UK.
Ignore those who say you don't get experience of weather... flying in FL gives you an appreciation of how quickly the weather can change and it means that you need to take more notice of the forecast. I remember a time where we were over 12nm from a storm yet still experienced up draughts and down draughts and extreme rain. You also get an appreciation of how temperature can affect landing/take off distances.
As previous posters have said "good luck with trying to find someone to rent you an aeroplane" or "they were useless when they came back" (para-phrased) they are clearly talking with limited experience and they have never flown in the states. Do your research and be realistic. Do your exams before you go so you can concentrate on flying and give yourself some time off to actually enjoy where you are.
Oh, and I got through my skills test on minimum time due to the continuity of training. No having a lesson one week then missing out for a few due to weather and then having to re-learn... 42 hours rattled out in 20.5 days and skills test taken in the minimum time.
Don't be put off by the miserable g*ts on this forum who are anti-doing-things-a-little-bit-differently. Enjoy the experience and learn in a way that is right for you. This forum is full of people who are negative and don't have a good thing to say and most are ill informed. Listen to those who have proven experience!