Nobody spends money particularly on an ecommerce / pos system / site unless they have to it would have cost mega bucks to implement and buy - they will have run into limitations with the old system that necessitated a change.
I was working for a retailer that spent $100k on a new pos system that was going to be the way forward forever and 2 years later had to buy another new system as it hit an inventory and customer limit that no one knew existed or ever thought they would hit.
Whilst there may be some issues right now I am sure they will get ironed out.
We just went through a long and expensive process for a new hardwired POS system (popular brand and equipment across many hospitality venues) because our inexpensive, reliable, user friendly, and easily updated system was apparently unreliable (more likely the coordinator wanted something "like they have in pubs..." as that is his background and where a lot of his mates work). Well surprise...the only substantial issues with our previous system was our wifi was shithouse (I ran the whole venue's POS off my phone for a lot of last year and it was fine every time I did) and our tablets were many generations old. The new system is a piece of unreliable garbage that is a pain in the arse to update/alter anything on. In the past I (or the others with the same level of secured access) could just log in at any terminal and update menus/items/prices/sales/wholesale/stock/etc etc etc and have it live almost instantly, now there is 3 people (Monday to Friday types) that can make the updates that can only be done through a specific desktop and then require a long delay to update at the terminals...not much use on a Friday night when someone has stocked a new item into the display and not put it in the POS! Not to forget the constant crashing and reverse updating it all does.
Not even sure how this relates...ummmm go sales POS!