theres not much positive to write about pinnacle cart expect it does the job.
This software if infected with ioncube, thus means you can not make changes to the software should you ever need to, so you would be held to ransom as and when the time comes, this makes it impossible to have your cart display the way you want it to, you will also be charged huge fees when you need to update the software. I bought pinnacle cart but unfortunately it was not secure and someone was able to send emails from my account without my knowledge, they wanted a substantial amount of money to upgrade their software even though thus was their fault in the first place. My advice is to use opencart which is free and open source and free for updates too.
Complicated platform to work with avoid it.