I don't know much about that particular bike, but I can say that the K2 bikes are good for entry level usage. You can look at some more of them on performancebikes.com
I will also say that in mountain biking, you really do get what you pay for, so it's always a good idea to get the best that you can afford. It almost always ends up cheaper to buy a bike with better components already on it than to get better components later. But, if you don't have any more money in the budget than what that bike costs, then this is so much better than going to Walmart.
Also, look around a bit and maybe ride a few bikes just to get a feel for what's comfortable and what you like. It'll really help you down the road if you decide that you want to invest more in the sport.
Good luck!
I will also say that in mountain biking, you really do get what you pay for, so it's always a good idea to get the best that you can afford. It almost always ends up cheaper to buy a bike with better components already on it than to get better components later. But, if you don't have any more money in the budget than what that bike costs, then this is so much better than going to Walmart.
Also, look around a bit and maybe ride a few bikes just to get a feel for what's comfortable and what you like. It'll really help you down the road if you decide that you want to invest more in the sport.
Good luck!