One potential Chestemere downside is its location relative to the part of Calgary it's near.
The reason developers are building nice house 5-10 minutes east of the city is that houses wouldn't sell right on the east edge of town. To a Calgarian, "West Chestemere" sounds a lot better than "East Abbeydale, Penbrooke, or Forest Lawn." The neighbourhoods on the east edge of the city around 16th Avenue north (#1 highway) and 17th ave SE have among the worst reputations in the city.
This isn't a big problem at present, as Chestemere is still a bit away from these neighbourhoods. Still, it's something to consider before you buy.