We use their VPN client at where I work...it's a mess. Disconnects all the time, IF you can even get it to connect in the first place, it like's to sit there for up to 20 minutes sometimes before it finally connects. Almost never works with captive portals, and all sorts of syncing issues with our network drives.

To be fair, it might just have to do with our company's implementation, our IT department pretty hit or miss when it comes to implementing new stuff, it only rolled our 6 months ago and we do have 30,000+ employees/contractors so I'd imagine it's headache getting everything just right, but still.