Just because one 5er cost less than another does not mean it is made cheaper, just like a higher price doesn't mean it is better. I have seen folks buy a "entry level" RV, and get much more service, and have far less problems than folks that have paid out the nose for a "high end" RV. Like every thing else. How good they are, and how long they will last, is dependent on how you care for it.
So find the one you like. Look it over very carefully, and make your own decision on if it suits your needs or not.