Hi Michael - Thanks for your question!
This is exactly the kind of scenario USB graphics is designed for and best at. Let’s look at the specifics of your system, then for compatibility.
The Dell Vostro 1520 has Intel Core 2 Duo processors and NVIDIA GeForce graphics
If you had an Intel Core 2 Duo side-by-side with an Core i3 or some more recent processor, running two USB monitors - you would notice the difference. The Core i3 would be a little bit snappier. But for the applications USB graphics are good at (everything except video playback and gaming), on the kind of resolutions you’d have with 19" monitors - the difference would be hardly noticeable. The processor on this system is good.
On the GeForce graphics - In general, DisplayLink drivers developed, tested, and run on lots of nVidia systems without problems. But we do see the occasional problem we don’t see on a pure Intel graphics system.
This particular laptop does not have a nVidia/Intel “hybrid” “switching” graphics solution that’s complex and sometimes problematic. That’s good.
The only problem I’ve seen in recent months on systems that are at all similar, are problems in standby/resume. They only affect a small portion of systems (usually actually higher performance ones), and DisplayLink has been working on fixing these problems (improvements in version 5.5 of the DisplayLink drivers). http://displaylink.org/forum/showthre…
So, in short, while I don’t have a Dell Vostro 1520 here, this looks like a good system for making use of USB graphics adapters, without any reason to anticipate compatiblity problems.
And in a case like this where you have two extra monitors to put to use, it’s both easy to setup and best available solution.
Hope that helps - thanks again for your question!