I have a SainSonic GT980 which is working well. It is also in the sub-$100 price range. It appears, physically and marking-wise, to be identical to the Zastone KT8900 and Juentai JT-6188.
I have started a Yahoo Group for the "Mini Radios"https://ca.groups.yahoo.com/neo/groups/MiniRadios/info https://ca.groups.yahoo.com/neo/groups/MiniRadios/info
This is a public group. Attachments are permitted. Members cannot hide email address. Listed in Yahoo Groups directory. Membership does not require approval. Messages are not moderated. Anyone can post messages. I propose to leave it this way unless the privileges are abused.
Please join and post your questions and comments. The more members, the greater depth of knowledge and experience to draw on.
Dennis KG4RUL