We have a shower bath combo and it has its pros and cons. It's a bit of a pita when bathing dd as I sit on a little stool to watch her, the glass sits against the towel racks held in place by the stool. But one of the best things is when dd (2.5yrs) starts going crazy and splashing everywhere I can simply close the glass door and the water is contained while I sit there watching her. When she calms down I open it again.
From a buy/sell point of view I wouldn't worry about it. We also have an ensuite and have a double sized shower.