The lack of builtin support for multiple monitors puts me off a bit. I'd like to see these USB adapters in action to see how well they work. The idea that Apple could easily break them with any update to OSX worries me (or indeed MSFT and a Win7 update)...
There's no worse risk of that than with any other bit of hardware. The Windows and MacOS drivers are indeed closed-source, so if Microsoft or Apple were to radically change the driver model and break all old drivers, you'd be dependent on Displaylink producing an update, just as you'd be dependent on the makers of every other peripheral you own. But such radical changes would only come with a completely new version of Windows (and I expect MacOS is the same), never with incremental updates.
The Linux drivers (udlfb) are open-source and are thus yours in perpetuity.
Peter
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