TomTom mount kit
Ordered this as an additional mount for another car and received it broken. It was promptly replaced with a working model and has functioned perfectly so far. I think the plastic piece inside the mount that was broken should be redesigned with some stronger material but other than that it works as advertised.

TomTom Warranty
My 910 mount recently broke after 11 months of sporadic use. I contacted TomTom and they stated the 910 came w/ a 2 year warranty! They replaced my mount and had it shipped to me immediately (got it in 3 days). I didn't even have to send the broken one back. Call TomTom 1st, their customer service was excellent.

Works great, when you use it correctly!
Like another reviewer mentioned, there is an old version, and a new one. Your best bet is to order it straight from TomTom. I currently have a new one, and will base my review on that! Anyhow, I really love this thing! The mount easily holds the weight of the GPS, and doesn't take up much room on the windshield when the GPS unit isn't attached. This thing is so reliable, it has actually been suctioned to my windshield for about 6 months as I write this. Now some of the problems people are encountering are probably due to them not twising the mount knob until they hear two "clicks". I highly recommend anything to do with the Go 910, including this mount.

What now?
My second mount kit just broke today while I was driving.
I only use this navigator once a week and this happended
twice in past 11 months.
I don't know if I have to buy the new one every 6 months.
Tomtom really need to improve this mount kit.
Even though I love my tomtom 910, because of this mount kit
I am seriously thinking about swiching to Garmin.

I hope Tomtom replace this one for me.

Will not stay mounted
This replacement mount falls off every other day. The original one stuck so well, it broke coming off!