They have only one shipping center in Southern CA, so it you're not near it, it can take up to 4 days coming and 4 days going (say if you are in Northeast). But they do ship on Saturday. And they do have that quick-ship deal which means that when the P.O. scans it as received, the next one is sent out <-- doesn't always work though.
I don't see them as competition with NF. If I'm renting something that's just not avail.@ NF, or is on NF's eternally long "Save" list. But I'll probably drop down from my 3 per for a short time & try them.