I've done the one at Fiesta Texas a few times. Is it fun? Yes. Worth the price? Not so much. It gave about the same amount of air as a S&S shot tower, which La Ronde has.
I think an underrated/overlooked element on this ride is the intense jolt up into the brake run, it provides the perfect mix of airtime and laterals. It was my 2nd favorite part of the ride behind the cliff dive.
As others have said, Iron Rattler was amazing, I personally liked it better than NTAG. No two seats give the same ride, I tried out every row and found that row 3 gave the strongest airtime. Other than the down-time from about 1 to 3, yesterday was amazing. Thanks Fiesta Texas for putting on this event, It'll keep me renewing my pass.