Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How flexible is the mount?  My dash has no flat surfaces.
Document: My phone and mount have a center of gravity forward of the mount, and the mat itself is soft and flexible and the sticky back is only to keep it from sliding (not pulling up), so I found it'd continually begin wobbling and bending as I drove until the mount and phone would tumble off the dash (which was soft vinyl). Product seemed high quality, but didn't work with my 5&#34; smartphone and suction cup mount.
While the  flexible mat conforms to the dash fine with nothing on it, when I put my device on it (after properly preparing the surface), the airspace under the non-flexible part (where the plastic suction mount is in the middle) is enough to create a gap that gets bigger and bigger until the whole thing falls forward in about 5 min. So now I just use the  original suction cup on the window and mount it low in the bottom left corner of my windshield.
This dash mount works great, I have a 5 in Garmin and it does not move at all.It does conform to my dash to a certain extent the edges don't lay completely flat but thatdoes not effect the way it works. This is a grat product up to now.
Lasted almost two days on  my dash before it melted (in less than 90 degree heat). The flat spot where you mount the suction cup melted onto the suction cup itself. The suction cup then peeled a layer of plastic away as it fell off. The mat is done for as there is no hope of getting a suction mount to grab the deformed plastic.
The base is large, and one of my cars didn't have a flat enough area for it to work. It worked fine in my pickup. Does what it is supposed to, but the ball on the GPS mount was too small, and the GPS moved around too much. I ended up putting a fingertip from a rubber glove over the ball before attaching it. That solved the problem.
I REALLY wanted to like this product because its a great concept and seems to be very well made. The problem is, it doesn't work in my car or with my device, but that's not to say it won't work with yours. The mat is very flexible, which may help on slight dash contours with a lightweight device attached to it, but I bought it to hold the car dock for my Droid X, which is rather large, and is heavy with the phone in it.
Doesn't fit quite as flat and tightly to the dash as I would have liked, but seems to be doing the job. Only used once at this writing.
had to replace the one stolen..loved it so much I had to have another..stays on dash, does not slide around and is flat so does not make gps taller..
the bottom part supposed to stick on the dash board yet it didn't it wasn't heavy and so when I put  something on it it won't hold the device. I like the idea of not being bulky and it's flat compare to those bean bag holder.
The Prius dash is very flat. Which should be good for the Nav-Mat II. However, my GPS holder is configured so that the center of mass is extended forward of the suction cup and this does appear to exert too much torque on the mat to keep it flat on the dash. I believe the Nav-Mat II is simply too light for units like mine. Interestingly, my GPS holder was only supporting a relatively small iPhone 4S. So...Beware.3.
Answer: My dash has a slight curve to it and it works just fine.