Well they should be able to flush all the bugs and problems complained about their add-on's atleast . I have had horrible experience last year so this year i think i will keep limited addon this year after this upgrade . I am using 5-8 addons only and so far any issues i have faced those devs have helped me without any hesitation . If i am paying for something i expect them to atleast try to fix the issue i am facing .
The only problem I have faced with support of a bought add on is that I was told it was fully responsive. The add on was not fully responsive. I was told that it was not a high priority issue although for me it is. I was not given a time frame for it to be fixed and was also told that there was nothing for me to do as it is bought as is.
I might be wrong but to me this is a case of false advertising. I don’t think the developer of the add on did this on purpose. I don’t want a refund; just want it to be responsive.
I would not recommend or use other add ons from this developer because of the way he responded but I actually think he did a good job with the add on except for the problem mentioned above.
I been burned by too many add-ons or styles between developer disappearing or claiming it didn't make enough for updating, promising updates for months etc to care anymore. I learned to expect everything "as is" now regardless of what's promised by the author.
Depends on the amount of money. If its free? You've really got nothing to complain about. If I'm paying $5? Meh, so long as it works. If I'm paying $40? You damn well better believe there should be support. And a LOT of it.