This is an interesting set of Chardonnays - 2005, 2006, 2007 and 2008. There does seem to be a house style, and there is oak. Not overwhelming, but it's definitely there.
It's hard to do a really full tasting on 4 Chardonnays, so I'll limit myself to fairly short notes:
2005 - I can see why this is the daily drinker for the bossman. It's drinking well, has nice aroma, good flavor, some complexity, good integration and a nice, fairly long finish. Quite a nice wine.
2006 - Quite similar to the 2005, but perhaps even better in a year or so. Drinking well and somewhat more complex. not quite as long a finish.
2007 - A little leaner than the 2005 or 2006, or should I say tighter. Aromas and flavors characteristic, the oak a little more noticeable. Longish finish.
2008 - Some offish aromas in this one, off flavors as well. Noticeable alcohol, oak My least favorite. Could well be an off bottle and not at all consistent with the other wines. I can't really evaluate the 2008 based on this bottle
This is a good value IMHO at $15 per, or even at $20 per. Very solid Chardonnay, with the sort of oak levels you'd expect in a good named village white Burgundy (other than Chablis) a level above the sort of simple village white Burgundies you see for $15-20 here on the East Coast. A sweet spot.
The wines are clearly developing nicely, and I'd think the 2005 is good for another 5+ years, with the 2006 and 2007 good for up to a decade. If you want to wait, which you might well not.
The Russian River Valley and associated Sonoma Coast areas are producing some very nice, not overly expensive Chardonnay these days.
If you like Chardonnay, this is a good choice to try.
SWMBO home and tasted all 4 without any input from me.
Her favorite is the 2005, with the 2006 close behind. She thought the 2007 not quite ready and the 2008 not right.