I used the same set on two different cars over a six year period. I'd say five out of the six yrs I had them out twice a year.
I don't have lift, so installing them with the engine and trans still in the car was a pita.
It would take forever to get the flanges lined up with the bolt holes in the heads.
Burned up my o2 sensor extension once. (My fault of course) Not cheap.
Since the car was lowered they scraped on speed bumps, ect.
Because of the camshaft, the engine shook, which caused them to bang on the floorpan.
Any time I needed to remove the trans, they had to be removed as well.
All I can think of now. Brings back bad memories. lol.