I had the SE300 and it worked great for faster planing. I think it made the wake smaller though. The problem is that it is really well designed for lift and also that it sits kind of far back on the outdrive. The latter characteristic causes a problem when you trim the outdrive up. Half of the thing comes out of the water and you lose most of the downward force you might otherwise have had.
It also caused prop cavitation on sharp turns.
So I bought some 3/8" stainless plate for $30 and made my own "stabilizer"...
With this one, the boat still planes much more quickly but the shape of it works much better for enlarging and cleaning up the wake. I also haven't noticed any cavitation problems with this one. As you can see, it is designed more like the Doel-Fin and Tigershark fins (wider and farther forward). The main reason I extended it back so far in the middle was to minimize bending and the resultant extra forces on the outdrive.
I would really recommend this do-it-yourself project if you have the time and tools. I think the end product is much better than any commercially available product for my intended use. All you need is a table saw with a cheap abrasive blade, a grinder, a belt sander, a drill, and a dremel (if you want to clean up the two inside corners). Total time: 3-5 hours. Oh, I also covered the contact surface with 1/8" peel-and-stick rubber padding to eliminate stress points on the outdrive. If you have a high-speed rotary sander/polisher, you could also make it really shiny. I just left mine with a matte finish.
BTW, the reason you don't need an actual foil-shaped stabilizer to help with planing is that the outdrive has a considerable downward angle relative to the running surface of the boat with the trim all the way down. I noticed this when I was taking pictures of the new "stabilizer".