What does cheaper mean?
Can't open more than 1 instance.
Can't launch .capx files from explorer window
Construct crashes if running for period of time
...
and the list continues
But just those 3 are worth double the money.
Multiple instances. 2 open capx on each monitor will save you hours and hours and hours of time
Launching .capx files from explorer window - will save you time (In steam you have to launch steam C2, file, open, browse to file to open)
The crashes - OMG, the amount of work lost, even with the backup features because of this... and steam response "We will not fix it"
I say again. You have been warned. Proceed with steam purchase with caution.