I used Lulu.
If you use it to make physical copies, you buy those copies yourself then you redistribute them, Lulu is fine for that.
If you let people order copies directly from Lulu and let Lulu takes care of order fulfillment, Lulu is also fine for that.
If you want to use Lulu not only to make physical copies but also to distribute copies to other book sellers on your behalf (e.g., distribute to Amazon, Barnes and Nobles, etc.), then I feel Lulu is on the expensive side in that they require you to choose some premium options to qualify your book into their distribution program.
Most of its IT system is fine but I had problem with how its website deal with Chinese fonts on the cover design; I got around that by rasterizing my entire cover design then uploading it to Lulu. I don't care enough to isolate the problem and determine whether it's a website-only problem or if it extents to its printing operation. Maybe it will be perfectly find for you if you don't use any CJK font.
Good luck.