I have an excuse, I'm on medication. Not that I'm NOT a wise@zz without it tho.
ut: I rarely pass up an opportunity to tease.
As a commercial diver we'd work in and around trees & branches all the time, always with surface air & hardwire comms.
If you're in water moving fast enough to push your purge button, it's time to switch to a hat or just get out of the crick alltogether.
Purge buttons on the AGA & Poseidon are towards the side, relatively small compared to a front mounted reg.
Some of my more memorable experiences involve trees in the Mississippi River at flood stage. (I worked the Great Lakes & Mississippi River flowage down past St Louis, pay rates too low in the south to make it worth while).
I must admit I'm somewhat predjuiced in the gear selection department, I tend to favor stuff that is very well built & will tend to keep spirit & body together under conditions that would otherwise dismantle the average package of dive gear.
Silicone FFMs, while more comfy, better sealing, and more UV resistant, will tear more easily than a rubber one. Usually happens at strap attachment points.
I use some of Ocean Reef's stuff, they have the best hose protectors out there.
For best AGA prices, take a look at:
http://www.dyk-brand.se/sidor/english.htm
How 'bout a nice DESCO pot instead?
oops, forgot to mention that the new Poseidon FFM will be using a Jetstream that's been made switchable between normal demand or positive pressure. VERY slick feature.