Some images of the Tag Heuer 540 set-up side by side with a Timy. Besides having ethernet capability (yeah!), the the biggest difference with respect to construction is all of the inputs and connections are off the back, with 4 built in inputs. The software is substantially different and more user friendly than other Tag Heuer devices.

After using it for one race, and setting it up for a second, the 540 would not turn on. It has been sent back to the distributor. I am on vacation, and since I have to purchase the device to keep playing with it, I won't have one to test as I have no immediate need to purchase one.
Jenna