I'm against any bugnet (or hammock, for that matter) with a zipper. When I want to get out of my hammock, I want to get out NOW. I don't like waking up wondering where the hell the zipper is. Call me claustrophobic, but fumbling with zippers was also one of the many reasons I hated tents.
That's why I prefer a bottom-entry bugnet (like the BIAS Buginator or DIY Fronkey) 'cause I can swing my feet out of the hammock and they're on the ground. I'll be running for the hills while the bear is munching on you zippered bugnetters!
The DIY top-entry bugnet (TED) is something I'd also consider 'cause it looks like you can get out of it lickety-split.