Logan,
You'll get bit with the medium action ugly. And, probably, just as often as with the u/l. If the fish are aggressive and putting on the feedbag, there won't be much difference. But, if they are hitting light (and they do many times), you may not be able to detect the lightest of hits and not pull as many as you would with the u/l.
If I'm tightlining with the rods in holders, I won't hesitate to use a medium action. If I'm jigging, I wouldn't even waste my time with one.
Hope that makes some sense.
Good Luck