The RB with Left Port is handy ONLY when shooting off a bench from pedestal rests. From prone, right handed shooters will find the standard right port easier. You don't need to switch your balance from side to side to load.
As far as performance, I expect typical Savage - no better no worse. The stock is certainly better then the typical tuperware but even that plastic stock can be made to work just fine. Personally, I don't think the forend is wide enough even on the HS stock for comfy RBLP useage (rifle is likely to roll too much).
With a slicked up bolt and a proper stock, I am sure many actions will be used in benchrest rifles. Although with the MSRP being so high, some will just opt for a full out custom and not have to do any tuning (arguably a better product too).
Savage is doing a commendable job of looking at the cutting edge of aftermarket and competitive shooting and trying to make appropriate products. Their F class rifles and this varminter are case in point.
However, like many large corporation, most decisions are made by committee that seem to be heading in opposing directions. Some on these committees may not even use the products they are cooking up. The concept is good. The execution not so good.
Just have a look at the stock designs on these F class rifles. I think we have found the committee that designed the camel.
By contrast, the barreled action has the right stuff. Savage really needs to learn how to design stocks.
Jerry