At $309, the Motobecane 400 HT is hard to beat compared to other mountain bikes in this price range. For starters, it is a 24 speed, and comes with Shimano Acera shifting that is nothing spectacular, but will get the job done for entry level mountain bikers. Additionally, it comes with disk brakes, which is very hard to find in this price range. The RST Capa forks with 80 mm of travel will smoothen out rides on the trails.
If you do decide to purchase a Motobecane 400 HT, it is important to keep in mind that you will need to maintain it yourself. This is something you can usually get for free when you buy a mountain bike at your local bike store, but you would have to pay an extra $100 to $200 for the same quality bike.
At some point after your Motobecane 400 HT has some wear on it, you may want to upgrade some of the components, such as the derailurs and the forks. This can be done relatively inexpensively on eBay. For example, Shimano Deore front derailurs are selling for as low as $10. You can also find great deals on other parts, such as Rock Shox forks.
Overall, the Motobecane 400 HT is a great entry level bike that you can get at a very reasonable price. If you are looking for something a little more advanced, you can pick up a Motobecane 500 HT for only a few dollars more, which will give you better shifting and a better fork.