we had a tige z3 with no tabs(used a suckgate a few times but mostly listed) and an r23 with gsa. same hull for both boats. I preferred the listed wave of the z3 better than the gsa tabs. I didn't personally notice enough difference to pay the cash. gsa felt a little longer but listed had a lot more push. fuel economy was a lot less with gsa as we were toting around an additional 1.5k in water weight being mostly level. make sure you have the right prop for a fully ballasted boat if you're listed now. the extra weight was noticeable between the 2 boats but could have been engine differences between the indmar motors. the z3 was the pre-raptor engine.

it was pretty cool tho to swap sides on the r23 in short order. not as clean as most want you to believe as even with gsa on a manufacturer stock boat, we still found that the surf side needed a few hundred in extra weight so still had to swap a few gallons and had 1000lbs in lead over stock. only took a minute or 2 and time switching riders took care of it.

if we surfed a lot all day long I can see the benefits to it but if we still had the z3, I would not have been impressed with a 5k add on as we spent maybe 2 or 3 hours of an 8hr day on the water surfing so swapping side to side was not a big deal for us and the gsa wave was not repeatable day over day. wind chop, surfing direction, people ballast and the such still impacted it enough to tweak it each outing.

all our experiences. ymmv...