Hello hugos7 and siddh.
Thought I would share my experience with you. This coming Oct. will be 2 years for me with the Isis. *WOW* I also had the Eidolon Diamonds for a little over 10 yrs. Like siddh I thought my room wouldn't be able to handle the Isis and would have bass issues. Surprisingly the Isis is more controlled, tighter, and more defined in the bass than the ED. When it's called for in the content the larger woofers of the Isis just supply that extra low extension and weight. This added low extension pays off big time on large orchestral works in the way of the soundstage & sound-space. The hall dimensions just sound so much larger and images within in the soundstage have more room to breathe within the space.
Also, a big congrats to siddh on his Times!!!