I have not had an integrated, but I have had RG4's, RG1's and Kraft 400's (Top Of The Line special order only now) amps. The Odyssey amps started off as Symphonic Line RG11's (IIRC), but are made in America and sold for about 1/3 the Symphonic Line price. Herr Germain (Symphonic Line) is known to keep the same basic amp design but tweak it. Klaus Bunge (Odyssey) is doing the same thing with the Stratos line.
I have had Odyssey Stratos, mono's and HT3's. As you go from Stratos to mono's you get a less strident top end and more control on bass. As you go from Odyssey mono's to full Gary mono's to say the RG4's, you get a more liquid sound and more bass control. When you get to the Kraft 250 mono's or the 400's, it would be very difficult to improve....from any SS amp in the world (my opinion). They (with a well paired pre) are just effortless and organic.
If you ask Klaus, and I have, the Odysseys are pretty darn good, but the Krafts are better.
Klaus is the North American, South American and Asian distributor of Symphonic Line and the owner of Odyssey.