I've had a few outcalls. Always privates and 99% of the time the girl who turns up hasn't been the girl whose pic was sent.
Luckily the girl on each occasion has been passable but the thought of telling a WL to go after she had gone to the expense of travelling seems pretty harsh and could lead to a heated scene which mightn't be such a good idea at a busy motel.
Possibly some of the higher end outcall agencies might be more reliable but I've never tried one.