Well, you can add my name to the long list. Aventon's customer support and warranty support is absolutely terrible. Bought a new Aventon, rear brake was DOA, rear fender scratched in shipping. Had the local shop bleed the brake. I filed the warranty claims for the brake and fender. Received an automated response for only one of them. After several days and sending a few emails inquiring about status and receiving no response at all, I started a chat session on their website yesterday. I explained the situation and the rep seemed to have no clue. She said a tech would "email me within this day". I explained that I didn't need tech support and that I just needed to be reimbursed for the bike shop's bill for bleeding my rear brake. She replied that I would need to submit a copy of the receipt - which I had already done as part of my warranty claim, but she had no idea. I asked her to confirm that I'd receive an email response by the end of the day and she said I would. Well guess what, no response. Big surprise. Then yesterday after my ride my rear brake handle nearly fell apart when a pin dropped out of the assembly. Not impressed with the Zoom brakes at all.
If you're considering an Aventon, be very aware of the poor support after the sale. I had read the same but went ahead with my purchase, hoping for better luck, but nope.
I really wonder about the long term viability of the company. I'm getting the impression that they're a woefully understaffed, fly by night company. Their bikes get good reviews (although you do wonder about the objectivity of these YouTube "reviews" when the company sends the reviewer a free bike) but they really seem to struggle with keeping up with the most basic customer support requests. If they don't get it together another company will end up pushing them aside.
I really hope I'll be able to come back to this post soon and report that all has been resolved to my satisfaction.