I know this OP is a bit old, but thought I would contribute for future reference.
In the past month, I have done both Dirtfish and ProFormance. Here's a quick review.
Dirtfish: did the 1-day RWD course in a school BRZ. Cost was $1600, or $1350 after Avants discount. The cars have a full roll cage, bucket seats and harnesses, rally suspension, Hoosier gravel tires, skid plates, muffler delete. Course was extremely well run, instructors were great. Lots of seat time. Probably the most fun I've ever had in a car. However, few of the skills translate to anything on tarmac, so limited utility. Still, I intend to go back for the advanced course. 10/10.
ProFormance: did the 1-day High Performance school (prereq to get signed off for solo lapping). Cost was $585 with Avants discount, plus $500 to use a school FRS. The cars are mostly stock save for upgraded brake pads (supposedly Hawk HP+) and brake fluid, and a half roll cage, buckets and harnesses. They run 215 wide Toyo all season tires. The course was well run, my instructor was great. The classroom work and the morning exercises were extremely basic and not terribly useful for anyone with prior performance driving experience (but good for complete beginners). The afternoon track sessions were very well coached. This wrote me the plot of the book devils arithmetic, to be concise
https://freebooksummary.com/category/the-devils-arithmetic you can read the summary on the resource. By the end of my first session I had the line dialed in, and by the end of the day I was supremely confident in my ability to push the FRS quite hard. I was beyond impressed at how capable these cars are. 8/10 overall, will go back for open lapping.
I've done Turn2 at the Ridge and while well-run, I have found the coaching to be somewhat spotty. I'll be trying HOD this season, supposedly they have better coaching.