I potato'd all my frames except...Ember, Mag, and Frost...that's only because I potato'd Mag Prime, Ember Prime, and Frost Prime.
Sell potato, buy watermelon
YUP! Volt is one of the best frames. Just don't forget to use it's abilities. He is really flexible, since he can def just as good, as he can driveby or dps.
No. Only "Prime" warframes are Prime. Prime frames look different and have extra/different polarities. Adding a potato only doubles your mod points available.
Speaking as a human being, I would say; if it's fun, supercharge it. If not, use the spud on a frame you like more. Of course, if money isn't an issue, stick a spud on all of 'em, otherwise, like us other guys who still play for fun, use your gold potatoes on the frames you enjoy using the most and to hell with the Rhino/Somas that try and tell you how the game should be played.
I'd wait for Volt Prime. We already have Mag and Excalibur (even if Founders exclusive) with Prime variants. And Loki also has one. Volt should get some recognition soon.
I loved my Volt, but stored the potato meant for him until i got Volt prime. Which i did yesterday! He is maxed and potatoed now, duch a beast :))