I am wondering if I got a good deal on this Lawnaire V. The guy said it's an '06 or '07, and that he only used it for a season. It appears to be barely used. My biggest concern is the engine - 3.5 HP Briggs and Stratton. Is it under-powered? Help me out and suggest how much you think it is worth. That way I can see if I made out ok. Thanks.