Borg Warner is a high standard brand manufacturer, they make excellent products.
Unless you push the engine much at all past 5000rpm, the stock rockers will be fine. The higher spring pressures do matter, but the only real improvement would come by way of the studs, not the rockers. If you can't upgrade the rocker stud/bolt size beyond the 5/16" OEM size, don't mess with roller rockers. It's too expensive for the power, so as you said only the strength matters. For a mildly over stock 302, in a truck with under 5500-5000rpm, the stock valvetrain is not overstressed.