I'll be surprised if any company especially one with the reputation like JRDG, releasing a product like the Concentra II, poorer in overall quality that the previous version.
I participated in the earlier thread which Onhwy61 was refering and did not even bother to reply to the person.
Obviously, the truth is in the listening and you'll see most positive comments on the Concentra some going to the extent that its one of the best Integrated amp's around.
You'll also see positive press from Absolute sound and it was very well rated by them. As far as I understand JRDG is not in the habit of building too much hype around its products nor getting extensive reviews of their products. However, you will still ee a lot of interest and with the recent range of 201, 501 and Concerto amps, prices have become more attractive