For myself I only noticed the weight on my de-ac for the first 5 minutes or so. It's pretty balanced and perhaps being former military (though it was 15 years ago) it felt natural to me. Mine is not a true de-ac as it was based off an airsoft though still looks good (also, I did not pay 400GBP - more like 400USD).
I'd like to see side by sides of a good de-ac vs. an MR in terms of accuracy though - I mean I can read through the text but it would be nice to see pix. Oh, and mine does have a folding stock and working charging handle, though not quite 100% as functional as it could be.