Over the years I've ridden quite a few TT bikes, the Kestrel 4000 tops the lot.
Rides and handles like a road bike and is very comfortable in the aerobars.
I agree that the hidden brakes are fiddly and I'm not too convinced with the movable dropouts. However, you cannot have it both ways.
I think the only criticism, which depends on your preference, is that it's not an edgy ride. It's delivers a smooth experience which might not be what you expect from a TT bike.
SteveMc