I'm asking for a friend who has a 2011-era MacBook Pro. She needs extra USB ports, and it looks like what she needs is a Thunderbolt device. The 2011 MacBook Pro has Thunderbolt 1, of course.
If she buys a Thunderbolt 2 device, will it work with her 2011-era MacBook Pro? She's going to upgrade her laptop at some point, and it would be nice for her to have the Thunderbolt 2 device so that it works at a higher speed out of the box once her laptop is newer.