$200 is a very good price for a Geo. Who has it for that price?
I have an Atom 1 and I don't really like it for a couple of reasons particular to the way I dive. I have the transmitter, but I don't use it, so it's kind of a waste to have it. Once you have a few dives under your belt, you can always estimate your air pressure within a hundred or so PSI, so you only need to check it a couple of times on each dive. On shallow dives I don't even look at the thing half of the time. The other thing I don't like is that it doesn't display the dive time in seconds.
The last thing I don't like is that a safety stop timer automatically appears on the display in place of the dive time every time you ascend to 20 feet. There's probably a way to turn off this feature, but I haven't figured it out yet.