This product does what it says and works well. It uses the standard bluetooth serial port profile, so it doesn't need any special drivers, and you can set up the device as a bluetooth slave or master so you can pair two of these together to form a serial->bluetooth->serial link without any host computer in the middle. Configuration is a one-time job, saved permanently on the device, and is about as straightforward as you can get with serial devices.
Just a couple of downsides:
1. Requires a Windows program for initial setup. Since setup is a one-time thing it's not a huge problem, but a perl script or the like to read/flash the settings would be nice, and would work on virtually all non-Windows platforms. (Setup is done via wired serial port, so it does not require drivers even for setup, but the setup protocol is not documented so you must use their program).
2. The device is quite long, port-to-antenna, and if you'll be using the power adapter (as most users will) that adds length to the back as well. You may need a right-angle adapter (or short serial cable) to use this if you don't have a lot of clearance behind your serial port. But the antenna is hinged so you can use it in any orientation, and it's light enough to suspend from the port, or from a dangling cable, without fear of damage.
And one suggested improvement:
There's no "null modem" mode. It's not hard to slap in an adapter, but it seems like an easy config option to add to a virtual serial port, and I'm disappointed I had to buy a physical adapter.
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