I was looking into it, Cubase does have some cool features but it seems like the basic functionality leaves a lot to be desired compared to Pro Tools. It actually has most of the same problems I have with Reaper, PLUS more...
-No trackbased edit groups
-Everything is region based (copy, paste, etc.) so I can't highlight part of a track and copy it, I would have to split the region into parts so that the part I want to copy is it's own region, and then copy and paste the region itself
That right there is enough to slow me down too much to justify the switch :/ I am just going to stick it out with Pro Tools and use Reaper for drum editing for now. Once Reaper steps it up a bit on the basic editing functionality, I can almost guarantee I'll be switching back.
The three big feature requests I'm waiting for are the addition of a proper edit cursor like PT, for making time selections on only certain tracks (although I could manage without this if they implement the other features properly), track based edit groups (even something as simple as adding an EDIT checkbox to a folder track, so that all the tracks within that folder have all edits applied to them at once. I can ALMOST duplicate this perfectly with just macros but not quite because of a few tricky scenarios and behaviours with certain actions), and most importantly TAPE STYLE EDITING. Right now in Reaper, even if you try your best to get the preferences right, it's impossible to drag an item from the left and have it overlap the start of an item on the right. You can do it from right to left or when you are dropping something smaller inside something bigger, but if you have a small region and are dropping a large one over top to cover it, the smaller one takes priority and sticks through, and dragging something from left to right causes the item on the right that you are trying to cover up to take priority over the item you are touching. It is ABSURD. So you have to manually cut and trim everything.
Please everyone in this thread vote for these three things on the Reaper forum!
http://forum.cockos.com/project.php?issueid=122
http://forum.cockos.com/project.php?issueid=1256
http://forum.cockos.com/project.php?issueid=843