The batteries on Uwatec computers last for a really long time. I have a Pro Nitrox that is almost 5 years old and has over 300 dives on it. The battery indicator reads 65% remaining. Chances are if you buy one now, you will not be replacing the battery for 7 years or more. By that time there is no telling what will be available in a new computer.
Personally, I think the Pro Ultra wrist mount for $300 is the best deal out of the Uwatec line. It does not have all the features of other computers for that price, but they are easy to read and very reliable. Downloading capability is definitely limited. The Smart Pro is $400 and will tell you the temperature and has lots more memory for downloading, but the microbubble level feature is not useful because the optional level stops obscure remaining no-stop time in the display.
IMO, the most frequent cause of dive computer failures is dead batteries. I can't think of a dive trip that I have been on where someone did not have a battery go out in a computer with replaceable batteries. The long life battery in Uwatec computers minimizes that problem. The next most frequent failure is caused by leakage into the battery compartment. On Uwatec computers the battery compartment is sealed up and packed with a gel to minimize the chances of leakage. Next down the line is pressure sensors, which is why AI computers seem to fail a bit more often than the others. they have two pressure sensors.
Remember nothing is 100% going to prevent you from getting bent. Use your brain. Read the Dr. Deco forum. There is a ton of good advice in it.
Please, no one interpret this as disparaging other brands of computers. There are a lot of happy users of Suunto, Oceanic/Aeris and other brands out there.