For what it's worth as another data point for discussion on this topic, I'll add my experiences with our shop purchasing the Koolertron version of this generator a couple of months ago.
The 60MHz unit arrived from the Ebay vendor's warehouse in Walton, KY quickly. Upon initial unboxing and examination of the unit, it was discovered that several waveforms were missing from the generator, right out of the box: Lorenz, Sinc (I assume they meant "Sync"?), Multi-Tone, Exp-Decay, Exp-Rise, and Noise. No waveforms were output, and the representative waveform on the display was missing; nothing but a flat-line. Immediately I filed a return. The vendor was quick to answer back with accusations that I didn't know how top operate the generator, that I should watch a video, and that obviously the generator was fine - the PEBKAG. They demanded me to post a video of the problem before they would do anything about it. I wasn't going to stand for that crap and having to jump through their hoops (I can't easily post a video for their amusement) and let them know exactly what was going to happen; send the defective device back for a full refund. First they stalled a few days. Then their shipping label that they uploaded to Ebay was irretrievable. Upon investigation, it was discovered that this is a frequent ploy that some less-than-honest sellers will do; upload an invalid .pdf file as a return shipping label, and in the process, shift all of the legwork of doing the return to the poor soul who bought the defective item in hopes that they'll eventually just give up, or perhaps stall things long enough that the return period will expire.
Long story short, I ended up having to drive tens of miles to get the thing shipped, using my own money. Their idea of "reimbursement" for the shipping fee was to short change me by exactly $1. They told me that since they accepted return on my device (yeah, after more than 2 weeks of back-and-forth ridiculousness!) they expected me to reverse the negative feedback given for the transaction (the first and ONLY time I've ever given such in 15 years of Ebaying). And their response to that negative feedback was that I didn't know how to operate the device. Uh... yeah. That's it... I knew how to get sine, square, triangle, and all kinds of other waveforms out of the device but for some reason I just didn't know how to operate the unit well enough to get those other waveforms out of it.
At least the ARB waveforms would work, and I left within the generator a nice little hand-drawn "hand with middle finger saluting them" waveform.
After all that fiasco, I bought the Feeltech model. The buttons aren't as nice, and I'll have to deal with the voltage on the ground lead, but other than this, so far so good... I just need to check what version of firmware.
And if anyone needs to know the vendor name, let me know.