I can only talk for my self. I'm pretty satisfied with the Service of technobit. The miner arrived in a reasonable time frame and the price performance ratio is very good.
The could improve the comunication with their costumers but i can understand if they dont focus on answering 1000 times the same question and focusing instead on delivering the miners.
If they reply to the first mail that a customer sends them, the customer isn't left in wondering and won't send any more mails. If the customer isn't lied to about the delivery date, then he won't send any mails asking about shipment.
Putting some time in customer service isn't a waste of time. Technobit is also getting so many mails with the same questions because it's a big issue that was left unanswered. Ignoring the client is one of the stupidest things you can do.
Any reasonable person will pardon a delay if they are given a legitimate reason.