You do need find a semi flat surface for it to work properly even though the base seems flexible

Other than that the base is solid and can support the large smartphone mount and arm with a Note 4 in place.

It's a very stable base to mount a phone from

I think this base would work excellent with a smaller extension arm and a smaller X-clamp mount for a phone

This is the perfect Base for my Garmin Nuvi 255W Car GPS.

Unfortunately, this base didn't work very well

The base is easy to