DL4 Versions

[Jax1723@aol.com]

I've been thinking about buying a line6 dl4 and I remember there being 
some 
discussion in reference to different versions and I'm wondering if anyone 
could tell me what those differences are.  Anything drastic?  I'll most 
likely wind up getting one through the mail so I might not be able to 
check 
it out before buying but I am curious.  Also... how can you tell which 
version you have?
Much thanks in advance
(wishing I could just buy an echoplex)
jack