I have an all gas range and adouble wallovens neither of which have rollers for the racks not sure what the real pupose would be .BTW I have a Bertazzoni

@PCC those racks can fully extend, allowing you to remove larger items from the oven more easily. They also take less force to pull out. Maybe not something you need or want but it is a nice feature for many.

@OP the specs of the range you're considering should say if it has one of those racks.

I don't think that the Bluestar RCS ranges have ever included the rolling extension rack (the RNB series does include one).

You can purchase it separately:

http://bluestar-store.mwrc.net/en/product.php?product_id=37709

In regard to your consideration of the Bluestar RCS sealed burner range, I would highly recommend the open burner over the sealed burner RCS. I've had the open burner 30" RCS for several years now and the burners are fantastic. Despite the lore that sealed burners are easier to keep clean, I've found the opposite to be true. I used to have a sealed burner 30" all gas Wolf range and keeping the burner areas clean was a misery. Drips land on the sealed metal pan that is right below (and touching) the burners. Because the pan gets hot, the drips tend to burn onto it. It forces you to clean almost every time there is a drip, which requires taking off the grates (large and heavy on the Wolf).

On the Bluestar open burner, the drip pan is a separate, thermally isolated, pull out drawer pan that sits out of sight about six inches below the burner surface. It can also be covered with aluminum foil which can be replaced as needed (rarely).

I prefer the non roll out. It is Ok for the bottom rack but I switch racks around so it is much easier with the traditional racks.

I just returned from my local appliance store. They had a BlueStar 30" RCS on display. It did not have the roll out racks but to wekick's comment above, it would be easier to switch racks around with the traditional racks.

I have an added roll out rack on my 30" Bluestar RCS. I really prefer it over the other racks for everyday use. It is a bit harder to switch around than the traditional racks, but I don't have to do it very often. There are more tabs to engage than traditional racks and it slides so easily that you have to hold onto each side of the rack to keep the slides from moving during the process. That said, I would really miss not having it.

@johnwilliams, that is a good idea. I didn't see that option in the customization section of the BlueStar website for the 30" RCS. Was that an option offered by BlueStar or did you get it somewhere else?

@Architectural Notice

I got the 30" rolling extension rack from BlueStar.

I went to the BlueStar on-line store and found the Full Extension Oven Rack 30". It is $400. Good to know there is an option to order this.