Zumo 550 and Zumo 660

[Mzee]

My Zumo 400 has served me well but it is due for an update because if I don't I will be zumoless. Supposing you were giving counsel on which one I should buy between the zumo 550 and the 660, how would you persuade me to take one and not the other?  

 

[Mzee]

 

[GSing]

 

[Mzee]

 

[GSing]

 

[Mzee]

 

[Roela]

 

[Manic]

 

[Mzee]

 

[Mzee]

 

[GundaGunda]

 

[Bergie]

 

[Biza]

 

[Mzee]

 

[GundaGunda]

 

[Mzee]