6 days to get response from Seller on missing manual. Received pdf of manual on 4th business day. Tone generator quality on the low tones has me concerned - may be a speaker quality issue. On the fence, as to keep or return and try another brand.
It took me a minute to figure out the controls in general but overall wasn't too hard to figure out after just playing around with it. The tuning is a little weird to set up at first especially since you have to make sure it's set to the right frequency and everything. But I did end up just looking for it in my tuning app on my phone.