Both the 2008 and 2009 Yatir Petit Verdots are excellent wine, and if I may relay Eran Goldwasser's comment directly about the two when Isaac and I tasted both at the winery last week he felt the main difference was allowing the PV to hang longer in the vineyard in 2009. He suggested softening the tannins and allowing the PV to more fully express it's special character as 2 reasons for the later harvest. The bit about 15% Merlot is interesting too, both Isaac and I felt the 2009 had "more going on" in it, but it certainly will be interesting to cellar both and see how they develop with 5 more years in the bottle. I don't recall Eran mentioning the Merlot in the 2009 - but that could be my recall failing - Isaac?
Regarding the price point of Ya'ar Yatir - it's typically subjective whether or not a very highly priced wine and very good wine is "worth the money." I can't speak about Covenant since I haven't tasted it yet (are you listening, Jeff Morgan?) and haven't had a Castel Grand Vin in a while either, but the Yaar Yatir shows every bit of ability to age beautifully along the lines of Yarden's best Cabernets and Katzrin Adoms, so one might think that comes with a price tag. It wouldn't surprise me if the Yatir top wines age as well, or even better, than any other red Kosher wines being produced today. Something to consider?
Life is too short to drink bad wine.