I have been using a Velleman dongle. I purchased it a few years back when I bought my commercial DMX gear.
I built a Lynx dongle when I got my first Expresses, but my show computer (old HP laptop) did not always see it on the USB port. It would work fine one day and the next day I would have to reboot the PC a couple of times before it would see it. On occasion, it would drop off the USB mid-show.
So I made a XLR 3 pin to Lynx adapter and went back to using the Velleman. It is better for me anyway, because I can still use my commercial gear in my show.
Since I am going to add a few Smart Strings next year, I will have to iron out my Lynx / USB issues. I was planning on replacing the laptop with a desktop and that may fix the issue. Some laptops tend to under power the USB ports and that very well may have been a part of the problem.