I have the HD locking doors and I like them. No rattling and a good place to lock up my GPS when going inside somewhere. They are expensive for what you get (typical Harley stuff) - but they are functional and fit nicely.
PS - If you get them, also get the glove box liners if you don't yet have them.
read the link in post #11 in this thread below. A lot of people happy with his glove box doors.
http://www.hdforums.com/forum/touring-models/501850-locking-doors-for-ultraclassic-lowers.html
I have the ones from eglidegoodies and really like them, good fit, waterproof so far, hardest part was finding a locksmith locally to rekey a barrel lock to the ignition key
I have a set and find them very handy. I feel more comfortable leaving things locked in them. As a matter of fact I didn't use the storage area before I got the locking doors. They don't rattle and so far I don't find anything leaking into them. I like that fact that the same key works on all my locks. I did however find them to be on the expensive side but then again most things from H-D are.