How do you know if you are getting one with the correct chipset?
Most online retailers don't show the specs in that depth of detail, and the local big box associates don't know which way is up.
I may try to find one if I ever receive the NetWalker PC-T1 that I ordered.
First check name and box. From there go to manufacturer page and download drivers. Check them for linux one and see which module is there.
So for example:
chipset name is adm851x then module is pegasus
chipset name asix module is asix
beware of chipsets sr9600 dm9600 and they comarades: dm9601 and similar.
If you can then save yourself a problem and go to local electronics mall (media markt, saturn in europe, radioshack and similar in USA) and look for those, If it is possible open the box and on the bottom of dongle you can see chip. In most cases there is a sticker but it can be safely peeled of.
I can tel that gembird dongles are made with adm and asix chipsets.