I have purchased many times from Panatime. They are awesome!! I usually get my stuff in 2 days if I order in the morning. They do seem to go on vacations a lot, but if you catch them in between they are a great resource. You won't find prices any cheaper and service is top notch. And to answer your question, yes all of the buckles I have bought from them are great too.
Elliot, Don Ginsler and TheWatchPrince all sell them, too. WatchPrince's are decent and really cheap, spring bar, though, not screw-in. I had one of Elliot's PVD buckles on my Davidsen PVD, pricey but a NICE buckle.