Hi,
I am looking to migrate my current 1.3.5-SP4 CS-cart to version 2.1.2 with all the data. Tried cart2cart but I think they are still not capable of migrating my data to 2.1.2. I have run into a few errors in the demo migration itself. I liked the pricing of cart2cart though.
Can anybody suggest me site migration services other than cart2cart? 
Thnx
Contact JesseLeeStringer here on the forum. Heās not cheap, but will do a great job for you.
Thnx. Will PM Jesse.
BTW, looks like cart2cart made a few corrections in their script and got the demo migration working although I didnāt do it myself. Their customer support did it for me. Really like their customer support. The demo data that has been migrated is working fine and without any issues. Lets see how the full migration would work. I am particularly concerned about migration of the orders.
For 1.3.x to 2.x, Jesseās definately your guy. Good luck. The ādemoā store is not very representative of a real merchant environment, but if it donāt work there, it certainly wonāt work in the real world.