I spent over 2 hours testing the KEF system this afternoon. Long story short:
- my Emira has a production number in the 150 - 200 range, so it is
one of the first production cars delivered
- it is fitted with an
alcantara interior (which I like in sports cars, it can be a sound killer I know)
-
the FM reception is not the first class (Tom wrote it is an usual Lotus problem) - I live 25 kms from both German and Polish borders and there is none German or Polish radio station

- have now only maybe 15 presets of Czech stations
- the DAB doesn't work in my car at all (have to ask my Lotus dealer if it is country dependent)
-
tried to adjust the "equalizer" 
- the system sounds much better with the
unusual combination of Bass = +7, Mid = +5, Treble = +7
- after setting of the "equalizer" the
streaming is fine (not a quality of high end systems in another cars but acceptable)
-
the system lacks power/volume - has to be set at about 60/70 percent of volume (whispering

) to 90/100 percent (loud music but volume acceptable for a long journey)
- I've learned on other systems (in other cars) that it's better to set the volume around 30 to 50 percent and the sound is much better than at full volume - this system doesn't allow that at all

(have to ask my dealer if my car has the new amplifier fitted)
- regardless if my amplifier should be 340 or 560 watt - I guess it is 50 watt or less
Conclusion: If the KEF system was the basic audio in the Emira, it would be acceptable after some playing with the "equalizer". Given that Base Edition customers will pay extra for it, I don't recommend it as it stands.
I will keep you updated after I get more info from my Lotus dealer.