I've owned: Zeagle Escape (standard BC); DiveRite Transpac (with a Venture wing); Aqualung Dimension i3; Hollis SMS100 Sidemount; Standard SS BP, and 32lb. OMS wing.
I *still* have the Zeagle (for travel -- obsolete model, but *still* excellent); Dimension i3 (for local/drive-able *recreational* dives -- because nothing else I have is as much fun to dive, or as comfortable); Hollis SMS100 (for extended bottom time -- which took a while to get used to, but I love it, now). I was never comfortable in the basic BP/W, or the TransPac -- I gave them a solid try, and *wanted* to like the spartan aspect of diving them, but, eventually sold them both.
My $.02
I *still* have the Zeagle (for travel -- obsolete model, but *still* excellent); Dimension i3 (for local/drive-able *recreational* dives -- because nothing else I have is as much fun to dive, or as comfortable); Hollis SMS100 (for extended bottom time -- which took a while to get used to, but I love it, now). I was never comfortable in the basic BP/W, or the TransPac -- I gave them a solid try, and *wanted* to like the spartan aspect of diving them, but, eventually sold them both.
My $.02