First, let me say that I spend a lot of time in the water. Most of my rebreather dives are in the 4-8 hour range at the shortest, most of which I spend scootering to or from the work site, and then surveying in the back of the cave. My revo is fully manual, and came with a single dream. I was never really happy with the dream display hanging off the box, particularly as I had not yet had a predator failure that forced me to look at it. I was also not really happy with the way the dream HUD provided information, it was just too general, it only displayed in a range, meaning that I still had to look at my handset for information, which can get annoying during a two hour scooter commute, and you can't see your handset over your bov and still be in a streamlined position.
A couple of weeks ago, my dream HUD quit working, so I saw this as an opportunity to change out to a shearwater HUD. The swap was easy, maybe 20 minutes in the shop, and the cables are plenty long enough to put the HUD controller box on the revo frame below the carry bar, instead of on the hoses, as they show in their manual. The shearwater didn't come with a manual in the box, which I thought was sort of annoying, but once I figured out how to turn it on (one touch) and calibrate (3 touches in one second) I was already starting to feel better about not having to do the familiar tapping/watching routine.
The shearwater is dead simple to understand, it blinks one time for each point above or below 1.0 either red or green. After a while you don't see the number of blinks, just how long the series lasts. I found that within minutes, I no longer had to look at my handset, the HUD actually gave me the information that I needed, and if I really wanted I could concentrate on the number of blinks and get the same detailed information my handset would give me. I was amazed at how fast the transition happened from handset to HUD centric information gathering.
My only downside was that the LEDs were a little too bright, but that was easily remedied by turning them away from my face, so they were not shining directly into my eyes.
All in all, two thumbs up for the shearwater HUD swap on the revo.
Anyone need a newly overhauled dream?