I'm not Jeep, but I share his opinion. For ME, it's about "balance" and "feel." The P228 balances and points beautifully. The P229, with its considerably heavier slide, feels "dead" in my hand - I think because of the significant increase in weight in the back of the slide. Oddly enough, I'm on exactly the opposite side of the fence on the P226 - I strongly prefer the feel and balance of newer, solid slide P226s than the older folded slides.
Regards,
Kevin