First of all: Schecter, Cort, etc are good instruments, but the necks are not similar to Ibby SR/EDB necks. I currently own a Cort Artisan and the neck is wider and chunkier; very comfy, but not as thin & narrow as a SR's. In fact I find it more similar to my W Thumb's profile & feel rather than to a standard SR neck (and I owned my share of Ibbys btw: SR500, SR400PB, all the EDB line, and so on). As for Schecters...pretty much the same as Corts.
Second: the typical Ibby spacing for a 5er is 16,5 mm - which is a very narrow spacing. If you're not familiar with such small distance between the strings, you might find the switch difficult (I must confess, for me it was impossible so in the end I switched back to 4 stringers). There are some BN models (such as the BTB475), but most Ibbys (and especially the SR line) have the 16,5 distance. So it's a good idea to visit a GS and test a few Ibby 5ers to see if you can adjust to it.
3rd: some 5ers have a 34" scale, others 35. It might seem a small difference, but when you play them, you can tell the difference. The 35 scale helps tightening the B, but in the same time you will have to readjust your finger memory.