It's a case when the zip is in the front you dont get as much of an opening to get into the suit as you do with a back zip. So it can be a bit harder to pull the wetsuit on especially over your shoulders blades but as the other lads have said it seems that this has been addressed in the modern suits.
Thanks for all the advice, i decided to get an animal assasin front zip suit. Looks the biz so looking forward to trying it out.