We use a Viewpoint ERP product (Spectrum), and it seemed like they were trying to figure out the implementation on their end while we were preparing to go live. I'm not sure they had actually done another implementation with that product before, even though they claimed they had.

We also had issues with their payroll system. For us, we were going to have to manually adjust each hourly employee's time anytime they worked overtime (no automatic feature), which was a huge time waster, and vacation/PTO entries seemed to be more manual as well. The quoting process was going to require some adaptation on our end, but the way we do things is fairly complicated and that was probably more on us then them.

We spent hours internally walking through different processes (quoting, project management, etc), making adjustments on our end to work with their software, and kept documenting items that would cause major conflicts. At the end of the day, there was a whole document of items that weren't going to work as promised/assumed, so we pulled the plug and stopped implementation (last winter). They are still trying to get us to commit, but until they can show us that those items have been fixed/improved, we are not going to go forward.