I've enjoyed the Gould series of Beethoven concertos for at least 20 years, and find them delightful. Still, though, I'm not entirely happy with that #1. To me it sounds tense and nervous, and the orchestral playing lacks subtlety and blend. (Like a mixture of sight-reading and just trying to keep up.) And in the way GG launches into the final movement, the meter is too ambiguous: the first note sounds like a downbeat rather than an upbeat. Those two completely wacky anachronistic cadenzas are fun, though!
Right now I particularly enjoy the new recording by Robert Levin with John Eliot Gardiner. It's energetic but also relaxed enough, not driven like a race. The cadenzas are fresh...they're improvised! The phrasing makes perfect sense, with a natural differentiation of strong and weak notes. All very well done.
Bradley Lehman, http://www-personal.umich.edu/~bpl