If you can find a recommendation for a flight school in FL I don't see a problem with conducting training and doing the GFT there to take advantage of the cheap flying and good weather. After all a CPL is a CPL.
On the other hand there are plenty of cowboy outfits over there ready to over book the aircraft in order to extract as much money from their students as possible but then the US is the home of the pilot factory and a lot of their flying academy's operate very successfully in that manner.
Having done the GFT in the UK I can tell you that unless you are very lucky with the weather you can waste a lot of time with cancelled lessons and tests. If you are driving to the airport every time before you cancel you're wasting a lot of money on fuel too and it's bad form not to at least turn up for the test unless the cloud base is on the deck or it's blowing a hoolie.
As has already been said though, if you go into the GFT with the attitude that it's a glorified PPL you will be in for a rude awakening. The flight has to conducted in a professional manner, the flying must be sharp and situational awareness impeccable and in short you need to fly like a well seasoned professional, certainly in the UK at least.
You can't be a pussy when taking decisions with the weather either, if you elect not to go because the wind isn't down the pipe or the forecast isn't CAVOK you will p*ss a lot of people off. If the weather is within limits you should take the professional but safe decision to go, it wont be held against you if it craps out and the forecast turns out to be inaccurate. PROB30s are a bugger here, that's where you need the experience. (Oh and you've got to do all this with your sphincter going ten to the dozen).
