Here's my take, although on a smaller boat (AR195). I have 2x 200 lbs bags and 1x 370 lb bag along with Yamaha's wake booster. I prefer with the Yamaha WakeEnhancer installed. I can install it easily from the transom or from the water. My total time from start to ready to surf is under 10 minutes including ballast and the WakeEnhancer.
So far, I don't have a wave I can surf ropeless with my 58" board. I'm 210 lbs. My wife and daughter haven't tried yet, but I'm pretty sure they'll be ok on the existing wave. I kind of feel that Yamaha oversold the 19ft kit with 2x200 lbs as being surfable. Maybe with a 6ft board? How much fun would that be?
There's no replacement for displacement ... so now I'm just waiting for the 650 lb transom bag to come in. Not only is lateral weight important, but getting some weight right on the transom seems to make a big difference. I've spent 5 days moving weight around (port/starboard fore/aft) and trying with and without the WakeEnhancer. Funny thing, I'm regular and if the boat does a gentle right turn the wave gets much bigger and I can just about get rid of the rope.
Wakesurf video clip
The WakeEnhancer does clean up the wake a lot and makes the face a little steeper and perhaps a hair less tall. Having tried with and without, I was closer to going ropeless with it installed.
My next test will be 650 lbs on the transom (Yamaha custom bag 650lbs) and then gradually fill the 370lbs in the ski locker to see how that impacts performance. I don't have much crew weight in the boat. 110lb wife and 65lb daughter. These are not dedicated surf boats and I don't expect a hip high wave I just want enough that the family can have fun. We use the boat for many other activities. This ain't my brother's Tige!
My advise: get the ballast and a pump first. Wakesurf boards are like downhill skis. There is such a thing as too big or too small. If you can, try to borrow one before you buy. I've noticed some shops will now allow you to try a board and exchange it if it doesn't work out. You might pay a little more but I think it's well worth it.
Also, don't forget about a rack. You don't want anyone chipping or denting any of those expensive boards.
Speed makes a huge difference. 10MPH is too slow 11.5 MPH is too fast. I'm waiting for a Ridesteady (Hydrophase) to come in. Even for wakeboarding, it's hard to maintain a consistent speed with a relatively small displacement jet boat. It sucks when the boat pull changes just as your about to hit the wake. When I was younger I could maintain 36mph plus or minus nothing through a slalom course with a 250lb skier thanks to the LT1 engine (350hp, 5.7L small block) only minute RPM changes were required as the skier pulled and released PerfectPass didn't exist and wasn't required with a bit of practice. With these jet boats, it's much harder to maintain a consistent speed.