We have had our 390bh for about a month now and we are currently on the road with a one week trip from Buffalo to Branson, MO. It's about 1000 miles each way. We made the trip with our 13 year old twins and my in laws with us. It has really worked out well. Our mileage on the way out was over 9 mpg. No major issues along the way that weren't my own fault! Minor things that will be taken care of by the dealer when we return.
If you are serious about buying one, we researched all the bunk house models and the Berkshire was the best bang for the buck by far. Also you may want to consider Buffalo RV, also known as RVOne or RVDirect. A lot of us on here bought ours from them and it has really worked out well.
2011 Berkshire 390bh