The problem is that different users and dealers call the different versions different names... It's very confusing. I have a BCE V2 with Lello datewheel and a V3 (or 4 depending on who you listen to). I do consider the V2 plus Lello the ultimate BCE. But without the correct DW to me the V2 is a monstruosity.
I have copied below a post by yodap on RG, which provides his perspective on all the different versions. You may find it useful (not sure if it's somewhere on RWI already):
V1 BCE:
+Correct length minute markers at 14,16,29,31,44 ...
-Dark hands
-Wrong datefont
-No AR
-No tick after 10 @ min counter
-Constant serial numbers
-Visible crown tube
V2 BCE:
+Correct silver hands
+AR
+Tick after 10 @ min counter
+Better datefont (still not good enough)
+Running serials
+BEST BRACELET OF ALL REP BCEs
+MOST 'CRISP' DIAL OF ALL REP BCEs
+Invisible crown tube
-Incorrect length minute markers at 14,16,29,31,44 ...
V3 BCE:
+Correct silver hands
+AR
+Tick after 10 @ min counter
+Correct datefont
+Running serials
+Invisible crown tube
-Crooked logo on dial
-Worse bracelet than V2
-Incorrect length minute markers at 14,16,29,31,44 ...
V4 BCE:
+Correct length minute markers at 14,16,29,31,44 ...
+Correct datefont
+Correct silver hands
+AR on TT models
+Tick after 10 @ min counter
-Yellowish AR reported on non TT models (CONFIRMED)
-Constant serial numbers
-Visible crown tube