I have an 18v Li-ion Makita and I too love it. Mine is this model:
http://www.amazon.com/Makita-BHP451-...8080134&sr=8-1
Although I bought it as part of this kit: http://www.amazon.com/Makita-LXT202-...3HXS3R1DD74G1X
The above driver DOES have a bit holder, two in fact. Both on the right side.
Makita also has this model, which doesn't have a bit holder. Perhaps this is the model you are looking at:
http://www.amazon.com/Makita-BDF452H...8080134&sr=8-3
I'm sorry, I can't comment on latter driver as I don't own it. But, I use my LXT202 kit on the job and around the house. It's always ready and drives what I need it to, from drilling holes into concrete for Tapcons (and then inserting said Tapcons) to hanging cabinets to.....whatever else I need to do.
HTH