I'm guessing you are referring to Version 1 of the neo's for £37 not the new neo package that's just come out? Anyway if you are I'm very happy with my centre but it is matched with other AE speakers - not sure if it would work with your Kef speakers but it doesn't sound like a marriage made in heaven...you can often get other neo speakers on ebay at reasonable prices...if yourre thinking of upgrade I would get fronts changed too at least.
Will