I ordered a USB 3 -> HDMI (DL-3500 based) device for home which should arrive some time next week, if no one else has responded by then I'll let you know how I get on with it.
I'm currently using a USB 2 -> HDMI (DL-165 based, I believe) device at work so I'll be able to compare it to that.
My Mac however, is a MacBookPro6,1 (Mid 2010) so only has USB 2 and you'll have to keep that in mind when I provide any results.
Most poor performance however is also due to the Mac DisplayLink drivers. If you're not already using them give the
2.2 Beta drivers a try as they definitely improve performance.