Yeah you have to be very careful of this kind of thing. Lots of suppliers will claim "we've got drivers for every PLC, DCS, BMS, RTU and QUERTY washing machine ever made".
And when you get your hands on it you find that the install is clunky, the help file was written by an offensively obtuse Ebonian, the GUI is primitive, it has significant limitations on what types of data it can access or the performance is dodgy. Am I exaggerating? Well no..I've run into any and all of the above in the last year or so.
Typically I've found that what you get for free is worth aproximately what you paid for it. Lesson. Try it before you buy into it. It's not the cost of the driver that hurts, it's the potential loss of credibility in front of the client and all the unchargeable hours spent doing re-writes and workarounds that cause the real pain.