First, let me say, James Ehnes is a superb violinist and does well in a lot of different repertoire, but I hate to say that Bartok isn't the composer for him regardless of what his attachment to these works are. He's too soft-edged for this music. He attempts to play Bartok beautifully, like Dmitry Sitkovetsky has tried to do, and both of these violinists fail in this kind of interpretation because I don't think it's what Bartok intended. Where's the passion? Where's the fire? Yes, Ehnes has great clarity in both concerti, but this isn't enough for me. In my view, Kyung-wha Chung still has the best account of these two concerti on record (VC's 1 & 2 w/ Solti/CSO, second recorded performance of VC 2 under Rattle/CBSO).
The accompaniment from Noseda and the BBC Philharmonic seems rather uninvolved. Noseda has turned in several good performances but this wasn't one of them. He doesn't seem too interested in the music. Let's face it: Solti, Boulez, and Ivan Fischer are still the supreme Bartok conductors of the last 30 years. Each of these conductors understand this music from the inside/out. Noseda is just bland and dull to the point of where it's almost insulting to be performing Bartok's music this way.
The audio quality was fine, but not even this can save this dismal performance. For a better account of the 1st and 2nd VCs, try Kyung-wha Chung or Thomas Zehetmair (Fischer/Budapest Festival Orch./Berlin Classics). These two violinists understand the music and how to actually achieve intensity and an emotional drive in their interpretations.