My 55 was a little over a year old when I let it go skimmerless and I have to say, the corals seem to like it. Cyano is always a threat though. You have to keep up on the waterchanges, feed less and provide extra circulation. I have my return breaking the water surface and a PH aimed at the surface.
My small tank has never had a skimmer and the corals go nuts in there. It's tough keeping enough circulation in there w/out blowing everything over so cyano has been a problem.
Sorry for rambling (I shouldn't try to Instant Message and post at the same time

)What I meant to say was make sure a tank is mature before you go skimmerless and be prepared for it to take a while to adjust. Sounds like you've got a handle on it, MRGUY.
~Alice