Heavy yes, but Ive had mine for a year and a half, with about 20 hours on them and they still look pretty darn good, have at least 80% tread, and thats all trail riding, not on the easiest stuff either. As far as overpriced, i don't think so either, they are on my hipers, and I havent had to plug a tire, or had leaks yet.
BTW, what are you running again for a trail tire?