Just for arguments sake there batsbrew:
I bought EZ 1 a while ago during a sale, which gave me an option to upgrade to SD 2 for just $79.00. Then I could use my EZ 1 libraries with it of course.
I could have then considered spending on the upgrade to EZ 2, but instead thanks to 'c'redit 'c'ard Larry's posts here, I purchased BFD2 with 'Greatest Hits Volume 1' all for $120.00 on KVR.
I've since added the NEIL PEART drum collection from the Snakes and Arrows tour to BFD2 for $49.00 on sale to use with my V-drum set up.
Now clearly with SD 2 and BFD2, I have no need or temptation to upgrade EZ 1 to 2.
So, for about the same price, consider what else in upgrades you may be able to find out there instead there bats.
Just something to consider as an alternative option...