I was lucky enough to try both the Katana 2 and a Stealth 2.0 tec (redundant bladder & single) and here were my thoughts as to why I chose the stealth with a single bladder.
- Katanas quick sizing whilst brilliant if needed I figured was pointless for me, once I'm fitted its not gonna need much more in its lifetime and it just felt like a failure point waiting to happen (sure plenty other will say otherwise).
- Stealth Tec just felt like it could be run over by several cars and would be fine, didn't get that same rugged feeling from the Katana (I know plenty use and love the Katana).
- Preferred the stealth's weight options when buying think was like 4 options to the Katanas 2....something along those lines
- I also already have easier access to X-Deep replacement parts, but with the tinterweb that is a reasonably mute point these days.
- They dive fantastically once set up as do most SM BCDs, but just felt more solid than the Katana in the water.
- In the end the people I dive with for the most part are Stealth tec 2 divers so getting help with adjustments and ideas for minor set ups was easier. But one friend did go from stealth to Katana 2 for the below reasons.
I did like the Katana 2 for the following
- Its inflator hose, loved a lot more than the stealth, softer and more maneuverable, not that point makes much difference when in the water. Just preferred it
- Katanas quick release buckle. again preferred that, felt more secure and easier to use, so much so may replace the stealths with one.
- Supremely easy to adjust and set up, hats off to Hollis on that one. That thing is an Instructors best friend.
- Its easy adjustment made it an easier system to get adjusted to dive with.
- Felt solid, but not as solid as the X-Deep in my opinion.
Redundant Bladder I just wasn't a fan of, both the above are solid as hell with rigid sections on the top of the bladder designed to take a beating and a half. If you pierce the bladder then something has gone absolutely horrifically wrong. These things are tanks, but everyone has their own preference in the end.
I did have the X-Deep Classic tec set up as well first...I hated that thing with a passion unknown to man, hence buying a new BCD. Thankfully the classic was given to me by a departing mate who had moved on to the stealth. So when choosing I was originally leaning more towards the Katana. Thankfully I had access to both in the dry and in the water before spending my pennies. The Classic I found an absolute faff, having a separated bladder from Harness for me is just annoying as hell and just not my cup of tea. I get why they did it and why Razor and some others do it based on the diving its designed for...just not for me. Although I did preferer the harness on the Classic compared to the stealth, softer and more comfortable. But thats about it.
All three units I had only had 1 dump valve. Iv not seen either with any more in my experience so far
Good luck on deciding, if you can try get your hands on as many BCDs and see what you feel like playing about with them, really no substitute, we people are fickle things in the end.
Dive 11l allys in general warm water, but few mates have had 0 issues with dry suits with both sets ups, they preferred the softer Katana to the x-deep. xdeeps harnesses are very stiff.