What X431 Pad are you refer to? Launch 5C tablet or X431 V+ (PRO3), both are PAD.
X431 5C PRO and X431 PRO performs almost the same functions. My vote on X431 5C, it is much cheaper than X431 Pro. X431 V+ (PRO3) is way to expensive (more than 1k USD) www.obd365.com/wholesale/original-x431-5c-pro-wifi-bluetooth.html
By "new x431 pad" I assume you mean the android based padii? I personally have this machine and LOVE it, I had a snapon solus and ford ids. This machine makes both obsolete and then some. you can program some modules, keys, scan pretty much everything. Amazing machine. A little tip would be never delete the old interfaces when you do a manufacturer update, sometimes the different interfaces are better at different tasks.
i would also like to add that i have used customer service a number of times and have be pleased with the outcome every time. Launch PRO equipment assumes a certain level of knowledge- say a PRO.... They do make more DIY geared machines that are excellent as well, I have the crp123 and its really good. Especially considering the price point of $250 to scan engine, trans, airbag, and abs of ANY manufacturer. Try to get that any where else- including FREE lifetime updates.
I have connected to many different makes and models. Not only with my pad 2 but also my crp123. Perhaps the one you experienced was a Launch knock-off. I have scanned MB, Hyundai, Kia, chevy, dodge, ford, volvo, bmw, toyota right off the top of my head. These have all worked exactly as claimed.