You'll get plenty of opinions here for sure. However, not too many Bullfrog dealers around so not too much known.
This is my opinion, take it for what you paid for it:
I think the jet pack thing is a bit gimmicky. From what I understand, the packs are somewhat expensive so most people don't buy additional ones. That kind of takes away the biggest selling point.
Terminator mentioned one of is associates sold Bullfrog and said the jets were fairly weak.
Having said that, make sure you wet test the spa. See how comfortable you find it. See if you like the jets and how they make you feel. If you really like all of that and you are comfortable with the dealer, go for it.
I have a Hot Spring Vanguard. I am now biased to Hot Spring and would probably only buy a Hot Spring from here on out. I just like what the company as a whole offers and the spas are very well made. I compared to other brands and felt like things on the Hot Spring were built well. The jets didn't feel plasticky. Okay, probably not a real word, but you get my point.
Good luck with your search. The main thing is to get a spa you feel comfortable in when testing it out. Don't buy one without testing.