Buy a subal housing for the nikon SB-900 flash

Is it interesting to buy a housing for the nikon SB-900 flash or buy a traditional uw strobe ?

Who has experience with this ?

I have never met a UW photographer that was a proponent of dedicated housed flashes. This seems to mostly breakdown like this.

Cons

Expensive $1000.00+housing,$400+ flash

Limited Beam Angle

Guide number much lower UW

You need dedicated 6 pin ports I think.

No easy back up if your system fails.

Most good UW photographers shoot manual anyway

Pros

True brand specific TTL. This would seem good for Macro. Full camera control.

2nd Curtain sync

Anyone else?