I went to the new Fairway today (5/3) in Plainview (on Manetto Hill Rd., Exit 45 South on the LIE, north of Old Country Road).
I'll give you may take on the place without making comparisons to the two city Fairways (as I have been in them only several times and none recently).
However, I will start with one comparison: The LI Fairway is much bigger than the UWS Fairyway (not saying much, I guess). It is huge (think your average mega-size Waldbaums). You enter the produce section with beautifully stack fruit and vegetables. They have a complete gourmet section with olive oils (1/2 an aisle), vinegars, mustards, etc.
They also have the expected seafood counter, meat counter (not a locker room like the uptown Fairway--no jackets required), cheese counter, olive bar, deli counter and so on. Many prepared foods are available to take home (e.g. pizzas, entrees,sandwiches, soups, salads, etc.).
In the center of the store is a "Cafe" with hot pizzas (including buffalo chicken pizza, seafood pizza, etc.), sushi (typical supermarket prepared varieties--disappointing), chicken wings, stir fry station (select your own ingredients) and sandwich bar. You can eat the food there at sit down tables. All in all, I thought this was a nice feature.
In addition to the gourmet half of the store, the back of the store resembles more of your typical supermarket with typical supermarket items (including frozen foods). Thus, this is truly a one-stop shopping experience for all (gourmet and otherwise) of your culinary (and household) needs.
One word of caution--the place was JAMMED on this, its second day. Finding a parking spot was as difficult as finding one in midtown.
However, I am very pleased with the new store and now see no reason to schlep from the Island into NYC for items that were previously unavailable here.