TKB Trading, LLC
I think the fact that they're trying to do many different things with an app really makes it overworked. I mostly used the app for Back in Stock notification. It was working well for the first month, but as more people started to use it the app started to perform slower and slower and ultimately stopped working. The developers were being very enthusiastic in helping me at first, but after couple of tickets I opened to report issues with the app with them, they started to ignore me and ultimately did nothing about it. It is really sad that this app is just like many apps I've seen that have real potentials but they got ruined by the lack of support from its creator. Don't believe me? try it and find out.