Got in the pool for the first time last night with my D200 and new Nexus housing, Inon 45 degree finder and Z240's. My thoughts:-
After expecting the rig to be heavier than my old Nexus Master, I was pleasantly surprised. With neoprene covers on the strobes and port and a couple of small foam sleeves on my ultralight arms it was only slightly negative and easy to hold one handed for the 90 minutes or so.
Optical TTL (a first for me) worked very well (shooting a Nik 60mm). Exposures very consistent (as per the histogram) and after 100 shots with the internal strobe firing (a previous concern), battery was still over half full.
Finder takes a little getting used to i.e. positioning your head correctly, but the large image and the fact that I get no bubbles hitting the housing - which used to annoy me at times - was fantastic. In fact it took me a while to realise there were no bubbles and I didn't have to move my head away.
I missed not having a focus lock control but then I use macro ports with MF control and don't see a problem with wideangle anyway.
Really wish there were a control for single/continuous AF though.
Inon strobes (first use for me) I found OK, but the controls were a little fiddly, especially when the strobes were positioned close to the camera body when shootong macro with this lens. But this shouldn't be so much of an issue with the 105+ or wideangle.
Overall, it exceeded my expectations & I would seriously considering this housing/strobe combination if in the market. Roll on the next trip......