My dive buddy and I dive with different dive computers. I have a Suunto Vyper and he has the Uwatec SmartPro. Both worked almost identically in terms of no deco limits in our recent diving -- except in one case recently on a dive to 28 meters. We both did a too rapid ascent from 2 meters, exceeding the computers' recommended rate (we printed the dive profile later to prove that was the problem). Absolutely, not a good practice . My computer beeped, so did his. Then the computers behaved very differently.
After 1 minute at the surface, his shut down for 24 hours, while mine registered the rapid ascent with a "slow" warning. We both agreed to stay out of the water for 24 hours, since his computer was non-functional (not even guage mode) and his manual advised it. But when we checked the dive profile, the only error was the rapid ascent, we were very conservative otherwise.
To my thinking, this is a major defect for the Uwatec. It should not shut down in the event of a diver error, at least give me guage mode in case I have an emergency. It is a tool for the diver to use, not a God to be followed. But that's how Uwatecs work, no matter what I think.
The second major issue I have with them is you have to send them to a factory repair site for battery change. Again, never mind what the customer wants, Uwatec knows better. With my Suunto, batteries are available everywhere, and I can change them and get back to diving. I carry the lithium battery and O-ring in my save a dive kit because I dive in remote locations.
Uwatec makes a good case for their more conservative algorithms, which take microbubbles into account. In practice, we noticed no difference except for the shutdown. It's up to you to decide if you want to use a computer as a tool, or have it be your master. As for me, I would never use an Uwatec even if it was given to me.