To answer the original post, there are quite a few with front bath floorplans that frequent the forum, I am sure they can chime in. But so far, I have not heard any real complaints about the plan. It's a front-runner plan for us as well. My concern was getting to the front bath while traveling (because we like the office in-place-of the 2nd downstairs 1/2 bath). I understand that there is a control to move the bedroom slide on its own for all of the front bath models (Landmark, Bighorn, BigCountry), so to move it a foot or so to get by the front of the bed should not be an issue.
Some have said with the king bed there is not much room to get around the sides of the bed. Some have opted to go with a queen bed instead. This can be ordered from the factory, or some have modified the bed platform and added their own queen mattress. From the factory, an added built-in nightstand might be available for the queen version.
Some have mentioned that they had some slight plumbing issues of slow drains in the early versions of the front bath. I have not heard many complaints recently. Note though, if you have the 1/2 bath downstairs, there is a separate dump handle for it, not in the universal docking station. This may mean bending down and reaching under the skirting to get to it.
Whatever you are looking at, Heartland products are the way to go! Great support from the company and this forum is here to help if you have any glitches.