I use my Zed daily and although my daily commute doesn't include motorways anymore, it does include a 'fast' open road, with a varying 40 and 50mph speed limit. Because of this, it's a hotspot for mobile speed cameras.
Using cruise control on this stretch of road means I'm not constantly checking the speedo 'just in case'.
But the above could be said for any car with CC and not just a Zed (although the temptation to plant your foot down hear the V6 is probably a lot higher than other cars)