My GF is a boarder and got a split board after slowshoeing for a while. It's an improvement over slowshoes, but she has come to the realization that she still has a lot of the same inherent issues with boarding. Getting stuck, having to carefully manage terrain to avoid flats and flat or uphill traverses, the time it takes to split and unsplit, the fact that on rolling trails and sidehills, it doesn't make that great of a pair of skis. I think a lot of this is because she goes out with skiers (me mostly) and that really makes obvious the deficiencies of boards vs skis. She also likes XC sking and i think she thought it would be a better pair of skis. I think she wouldn't notice if she was with other boarders rather than long time BC skiers who are quick and efficient in how they get around.
Lately she has been saying things like she's going to check out AT gear. I try to tell her it's not a big deal to me but I think she was expecting that owning a split board would make a bigger difference than it does. I think as she gets better at all the little nuances and tricks she might be a little less frustrated. OTOH, she might get a AT set up.