I thought having Navigation in my Z4 was cool, but I honestly never used it much. As a result it wasnt a factor when I was looking for an E92. Needless to say, I purchased an E92 without Navigation and I have no regrets.
In my opinion it is one less electrical device to go faulty = more piece of mind for me.
'11 335i M-Sport xDrive Coupe [LMB] COBB V3 & PTF Tune | 4in BERK DP | VRSF 5in FMIC | BMS Intake | ER CP | Exotics Tuning CF Lip | CF Diffuser | Eibach Springs | Bilstein Shocks
'07 BMW 335i Coupe & BMW Z4 3.0i - Gone