I think that is definitely a good deal for what you're getting. If you are simply planning on tootling around on dirt roads and non-technical trails designed for families and such, these bikes will be ideal. Bear in mind, though, that if you are planning to get into mountain biking seriously there are a lot of things on the 4300 that you will outgrow quite rapidly. If whatever bikes you are on now are anything above entry-level, you will probably find shifting and braking disappointing compared to what you are used to. That said, all the components on the 4300 are reliable and easily serviceable (i.e. spares are readily available), and the frame is good enough to be worth upgrading bits and pieces with better bits and pieces as you wear things out.