We had a team diving with Sidemount during our 2-weeks safari at Truk Lagoon. Thus, it was 100% wreck diving safari, and with sidemount. In fact three of us were starting sidemount diving at that time, and we didi TDI Sidemount course before our trip (ok, some training dives also @ Truk). For me this new gear is abslolutely best choice, due to many benefits. For example; it's so easy to descend to water and connect tanks on water, but even better is to come up as you can hand over the tank for your buddy who is in boat, and step up without heavy gear on your back. Also, penetration to narrow places is so easy with tanks which you can turn to front of you. Furthermore: it's so easy to add (and even switch tank for buddy if she/he needs more air) tanks during the dive. And much more. I strongly recommend sidemount - I'm not going back to "old jacket with tank on back" -gear,
Have a look to our dives @ Truk Lagoon, in which you see some sidemount divers.
Truk Lagoon, Micronesia - YouTube
(I recommend especially the video of "Sankisan Maru")