I agree with Kellwolf. GIA is the lowest of the low. Paying for a position where you should be payed. ATP, Pan Am, FSA, JET U etc. are different in that you are paying for sim, ground training. These bridge programs will cost anywhere form $4000-$28,000.
The consensus on this forum seems to be to save your money and be well versed in the basics and you will do just fine. Like someone earlier in this forum had mentioned, the more people that start doing the bridge programs, the less training the regionals will offer the new FO's therefore making it much tougher for the hard working CFI paying his/her dues to make it through the airline training. By standing together and rejecting these costly bridge programs we can ensure the quality and thoroughness of future regional ground schools.