It depends on quite a lot of factors, like goal, budget, features, etc.
If U just wanna run for fun, not training etc, a simple sports watch with a stopwatch will do. This will enable U to keep the time ran on Ur favorite route, & if U run the same route everytime, U'll be able to tell whether U've improved simply by clocking a better time.
But if U wanna know how much effort U've put into Ur run, how much calories U've burned, if Ur training to achieve a specific goal, then U might wanna consider a watch with heart rate monitor feature. There are complicated ones, as well as simple ones. Well-known heart rate monitors like Polar, Timex, Mio, even Garmin, they have several models to suit different needs. Some models just display heart rate readouts. Some models allow U to set lower & upper limits so U can set Ur target training zone.
The ultimate ones of course have so many features that might not be that useful to casual runners (unless U have the budget, of course). These can record Ur workouts & allow U to analyze so many things. Some can also measure the distance U've run, some can also record mileage for particular shoes Ur using.
When I started running I just used a simple Timex 1440 sportswatch. After about a year, when I started entering races, I bought the Timex Fitness HRM. Now that I wanna go faster in races (plus the fact that the Timex is no longer reliable), I use Polar RS300x SD.
The device itself won't make U go faster. But the way U use it, U can train more effectively when U know how hard exactly Ur running. U can follow a training program & prevent from going too hard on easy days, too easy on hard days. U can learn to push Urself, discover the limits of Ur body. I can go on & on about this, but in the end, it depends on Ur running goal.
I think ccube uses Garmin, I think FR60 (right, ccube ?). Garmin Forerunner 405 also is am advanced model, uses GPS to measure distances.
Cool. Thnks for the info. Very well said. I would like to consider having one once I've proven to myself that this is the path that I want to take (Again, I'm just person who just want to have some sort of exercise aside from going to gym. Im still not sure if running will be my lifestyle for life). I think after running Penang&Singapore Marathon, then I will know.