I dive with a D4i and love it. Yes, the display is smaller than say the Oceanic Datamax, but it is a watch style computer. I think you know what you are getting as far as display goes when are looking to buy a watch style computer. I have not had any problems with my computer, therefor have not had to deal with Suunto customer service, so I can not give any input there other than that they have been helpful over the phone in certain situations (and also on their FAQ section online). The battery lasts a long time. I am a recreational diver however and only make about 20 dives a year. It has lasted me 2 seasons though and I have not had to change the battery yet. The battery is easy enough to change by yourself, but that voids the warranty. However, $50-70 every couple of years at your local DS isn't really a deal breaker. As far as the conservative algorithm, I err on the side of caution anyway and have not been cut short on any dives vs other computers I used in the past (it is also customizable, so you can adjust the P02 for a more or less conservative profile). I am not like most of the tec divers on this site who want to shove their preferred styles and brands down your throat. Also, the USB cable will more than likely come with whatever you buy. They are expensive if you lose it ($65 on Leisure Pro). Also, I LOVE the AI feature and the transmitter has worked flawlessly for me and the battery for the transmitter us user changeable. I still dive with my gauges, because like I said, I err on the side of caution, but have never needed them.