My dad has an exige. 2006 with the touring pack and an exhaust pack (I think). It has an MP3 CD player/radio but it has not once been used as it's so loud. Build quality is um iffy, it does get moisture inside and you have to be careful when washing it as it gets in around the windows! Also from what I can remember, bills are a bit $$$. We had a mouse nibble through some rubber gaiters or something in each corner which will fail the MOT apparently and it was over £1k to fix (not sure on the specifics though)
Now on to the good bits!! Performance/noise is just awesome, especially when the variable valve timing kicks in! Practicality wise it's obviously not what you buy it for, but you can get some lugs fitted (which my dad has done) so that you can fit a soft roof, which fits in the boot with a weekends worth of clothes. Plus it does 40mpg as it is so light! Just wish I could be insured to drive it!
Just realised that you are looking for supercharged versions, which ours isn't but it is still fantastic