I have a 2007 Sportscoach Pathfinder 377DS. I have the 300 Cummins. It is not the level of a higher end Newmar or a Monaco, but I think they are nice coaches. Mine is not underpowered at all. I've driven it about 20,000 miles so far, across mountains and deserts...no problems.
If I were to sell mine, I'd look at another. I think they are one of the better values in motorhomes out there, and a notch higher than a Thor in quality from what I've seen.
Here's a review I wrote a while back:
Sportscoach Pathfinder - 1 year later