I have a small wrist, so main reason for buying the Suunto Mosquito Gauge for its size. SUNNTO is known for its good quality dive computer. Living on isolated island much easier and quicker for me to change battery myself. I am now with my second Suunto Mosquito Gauge which has gone belly up after one year. My first mosquito, same problem. Depth gauge goes crazy, on land, anywhere. How unreliable!!!!!!!! There is a reason why SUUNTO no longer produces Mosquito. What about all time, hassles and money spent on those of us who purchased Mosquito hoping to have a good reliable dive computer for many years?????????

Good dive computer for anyone but a pro.

No messing or waiting for contacts to dry, easy function menus, compared to my husbands Stinger, Suunto Mosquito was slightly more conservative. Why spend more on the Stinger when the mozzy performs at the same level with the same functions? Reliable with good dive log info storage and reassuring to spot many dive instructors using the mozzy too! Comfortable to wear both in and out of the water; a good choice for the females and males alike. A 'jelly fish' cover can be fitted which provides good screen protection and better visability when diving - well worth a few extra pounds.

Suunto Mosquito is unreliable, re-sets to year 2000 after and during dives: even re-sets itself when you are no where neer it!!!!. When it re-sets it deletes all current Nitrogen etc... history, so that you can not use for a repetative dive.

Not 'Replacing Luck' but, Reintroducing Luck....

I bought the Suunto Mosquito due to the gas bubble model used. The dive computer is probably more conservative than other computers, and you can set it to be even more conservative. Given the number of bends received by people diving within the recommended levels of their dive computers, and the fact that I do repetitive diving over multiple days, I believe conservative to be better in terms of safety.
My last set of dives, in Malaysia, I lost my regular watch while I was white-water rafting. I was able to use the Mosquito as a reasonable watch in the mean time.
I have had one problem with my dive computer, when I got a spurious reading. Suunto took the computer back, checked it and sent me out a new one, under warranty, even though it was two years old. They also extracted all the data from the computer before returning it, but the diskette got damaged in transit, so they then mailed it back (and when I asked them to, they even merged the data with my existing dive log for me and mailed that back). Customer service at Suunto is first class.
If you are hesitating between a Stinger and a Mosquito, note that the Stinger does not have user-changeable batteries. It has to be sent back to Suunto, which is not the most convenient thing to do, since I have seen the battery power meter fade relatively quickly once it starts to go. With the Mosquito, I carry a spare battery with me, particularly when I go on a longer trip.
For visibility underwater, I have never had a problem at all, though compared with other computers, the display is small (not surprising on a watch-sized computer). The display is very clear and easy-to-read, even the ascent rate meter up the side. No-decompression time is prominently displayed in the centre, and other data is easy to read around that.
At night, there is a lit display, but for that you have to push a button. The back of the display is not electro-luminescent, so you cannot hold a torch to it and then read it off - you have to point your torch at it and read it. To be honest, this has never been a problem on any of my night dives.
For Mac users, there are, as far as I know, no dive computers with software that is directly compatible. There is Unix software out there you can run on a Mac that will give you ways of getting the dive computer data and adding it to a log system.
If you use a PC, the dive log nicely prints out an excellent summary of dives - one per page (unless you really write a big dive description, then it will print out two pages) with nitrogen information, temperatures (air, maximum depth and surface), surface interval, dive time, maximum and average depth, a full graphical dive profile with any alarms that were triggered during the dive, plus space for loads of other data you can put in, including five customisable fields.