Originally Posted by Triple A Racing
However.... we'd say don't bother trying to migrate either via the official X-Cart method or your own scripts or tricks etc especially if you have a heavily modified XC4 store. Create a new XC5 store from scratch (see below)
I don't really agree with this.
If you have stock (or almost stock) store it is ok to use the migration wizard. It has been improved lately and apart from few hiccups works very good now.
If you have customized store - getting the data transferred with custom scripts is the way to go. And it is possible. I have done it on few stores so far and there is no problem with this approach.
Starting from scratch is acceptable if you are willing to lose all data you have in the store but usually this is not the case.
It does cost to do custom scripts but there is also the factor of pissed off customers who will go to your competition if you choose to start from scratch. Weight the risk vs cost in a long run. There is always a solution or should we call it "the lesser evil"...