Dan:
I played Sunday River while on vacation in Maine a month ago. I don't have time for a detailed review, and am not qualified to do so having only played the course once, but I will provide my thoughts for what they are worth.
First off, I really enjoyed the course, as did each of the other members of our group of eight. The course is a mountain course, with a few steep uphill and downhill holes, but you never feel like you are playing one of those goofy drop-shots where you are hitting a 200 yard 8 iron straight down a ski slope. That said, the course is not walkable, and I believe carts are mandatory. There are many holes with long and hilly treks from one green to the next tee.
The course has a number of holes with natural sandy waste areas, with a little bit of a Pine Valley feel. The best of the holes, in my opinion, are the following:
* 2nd, a 420 yard (?) downhill par four, that has a large waste bunker on the left that rewards a big hitter who can carry the bunker and cut the dogleg with a wedge to the green.
* 5th, a 450 yard (?) dogleg left par four, with a waste area on the left and a large Big Bertha like bunker in the middle of the fairway, about 255 off the tee. Your choice is to hit a smooth driver or fairway wood short of the Big Bertha bunker, leaving a blind downhill shot of 200 yards or so to a narrow but long green that slopes away from you, or play an aggressive draw between the Big Bertha bunker and the waste area, which should crest the hill and leave a downhill mid-iron to a visible green.
* 6th, 185 yards, which plays slightly uphill and requires a carry over a nasty waste area that comes right up to the green.
All in all, I thought Sunday River was one of the better mountain courses I have played, and I am usually not a fan of mountain golf. The club has a nice clubhouse with a small lodge feel, and everyone at the club was very welcoming. We did not eat at the club, but they do have a nice selection of local beers on tap.
As far as being worth a drive from PA, I'm not sure about that. I would drive a couple of hours to play Sunday River every now and then, but that is about it for me.
We were able to play for $60, as guests of the folks who rented us our vacation home for the week. Sunday River was an incredible bargain at that price. I believe the rack rate green fees are $100 - $120. That seems fair to me for the quality of the course.
Mike