Three things I see with flying in the US;
1) The USD vs GBP isn't great at the moment, if you work out the costs they aren't really that much cheaper. Example:
OFT PPL Course - £5,752 ($8,525USD)
Flights to the US probably between £400-700
Food/Car Rental/Social Occasions?
Highland Airways in Inverness PPL - £4,600
Accommodation - £10 per night.
Obviously the weather is better in Florida.
2) The American flying enviroment is completly different to Europe; the weather, terrain, radio phraselogoy etc. are all different so you wouldn't have any proper European experience.
3) If you pay all your money into the states then their economy benefits and ours suffers, meaning air training schools will have to push their prices up because of the lack of clients, it also means that those who become instructors may be affected by the trade leaving the country.
Many people me disagree with me, but thats my views on it