Mac POS Subjective Comparison

Star TSP600 or TSP700 receipt printers
Buy the USB versions. Period. Serial is going the way of the Dodo (thankfully).

Having initially purchased the 613U, I have since returned it in favor of the 643U. When printing credit card receipts, you definately want the bar cutter to partially cut the receipt between pages. Tearing the receipt in two is not cool. Otherwise, the 613U is a perfectly acceptable printer as well.

When you order paper, keep in mind that you must order special two color paper in order for the printer to use that second color capability. The drivers I downloaded (v0.0.3) from Star's web site work just peachy with MacOS X (10.3-10.4).

Logic Controls PD3000UP Pole Display
I own a PD3000UP (USB). It doesn't work with any Mac OS POS software and there aren't (yet) any drivers available for use with OS X. This is primarily the shortcomings of Logic Controls not having developed an OS X driver.

However the PD3000D serial (and a Keyspan serial adapter) will work with various POS apps including Shopkeeper.

HHP 3800i Bar Code Scanner
Spiffy little CDD scanner. Works very reliably. I've been told they're extremely durable, as compared to the more fragile Laser scanner. So far it's been great. Plug it in and go.