I'm a recreational diver. I use the "Vytec-1" with wireless pressure transmitter. I got it to back up my "Cobra-1" with its HP readout. Altho I got the Vytec as "dive vacation insurance," I realized that I could benefit by using it with the Cobra on all dives. They have identical displays, identical algorithms, and both show pressure. I find with the Vytec mounted on my wrist, I'm more on top of my numbers, and it's especially easy to track them during free ascents.
I like the Vytec and Cobra for the RGBM deco model, nitrox, good user interface, dive planning mode (lets you see how much bottom time you get for a given SI), and ability to upload dives to the Suunto Dive Manager electronic dive log (PC only). The dive log has a couple of special features: it computes your SAC rate, it displays your tissue loadings as a function of dive time as you move the cursor along the dive profile graph, and it lets you export dive data to DAN for a long-term decompression project. You can change the batteries in both, yourself, BTW.
The Vytec's pressure transmitter works very well, but you have to remember to pair it with the Vytec before you splash in. I think its documentation is a bit weak. For example, I had to figure out some things myself, such as what "FAIL" means on the Vytec display when I jump in the water. [Tip: The transmitter stops broadcasting pressure after 5 to 40 or so minutes, to save the battery. At that point the display shows "FAIL." By simply causing gas to flow (take a breath, purge, etc.), the pressure readout is restored.] For anybody who's interested, I've attached my own notes on pairing the transmitter with the Vytec.