I have an old AVT 838(serial), an AVT 852(usb and does CAN), the obdlink SX(usb), vxdiag nano and https://obdxpro.com/ among many other things. The obdlink sx is the cheapest(very slow), the obdxpro vt was built by the pcmhammer guys and is very fast and quite reasonable as well. I'm a cable kinda guy so I have no experience with the wireless stuff. I also don't have comm issues ;)
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