Zumo 660 or Montana ?
 

want to go for a better GPS than 60 series.

Montana and Zumo 660 on the list.
When read reviews more people complains about Zumo.

Can somebody who has/used both can make a comparison please.
Need an expert's advice and look what is cons and pros?

Thanks for all replies !

That could be the reason why you are not getting any replies-
Easiest way maybe for you to go to the Garmin site and do a product comparison then decide what suits your needs.

From a personal ownership point of view, I can only recommend the following
My old 278C now sold
and current units 62S as I needed a small handheld
Montana 600 to replace my 278C

Review of Montana here

Can I start by saying that I have never used either of these units, but have looked at both as a possible next purchase.
I don't know how you plan to use a satnav, so that may be the big question that your going to have to ask yourself. If like me your going to stick to tarmac, then the 660 is possibly the best choice. I will stand corrected on this but I don't think the 660 is aimed at or intended for "off road" use. The Montana on the other hand is. And as such would be a great choice. My big problem with it is that if I purchase one, I would also have to buy City Navigator maps for it. That starts to bump up the price. And as much as I would love the long battery life and Topo maps that the Montana has to offer, I have to ask if it's worth it.

P.S. Out of curiosity, what were the bad point of the 660 you mention