Volt is a pretty good frame and still sees a lot of use in ESO, Bosses (Eidolon/Profit Taker) and is also a pretty common pick for Relic missions or anything where you just want to run fast. If you see his relics available from Baro/Prime Resurgence, it is worth it to try farming him because of how well he performs in these missions.

Prime warframes just offer minor stat boosts and polarity differences. In Volt’s case his prime has +25 armor and +150 max energy at max rank along with an extra “V” polarity with everything else being exactly the same. If you don’t want to farm the Prime version/wait for it to become available, you can find the parts for his base version from the Tenno Lab in your dojo, or look for someone selling the set. (https://warframe.market will generally have better prices than what you will find in trade chat)

As for his Abilities:

Shock - I don’t find Shock particularly useful, but with its Shock Trooper Augment you can add electricity to your weapons or combine it with any unpaired base elements (Just be aware that it may mess with your teammates’ elemental combos, it’s still annoying having “Thermal Sunder Titanias” turning my Toxin damage into Gas with their Augment)

Speed - I generally like this ability because of how much warframe is focused around mobility, some teammates may find it annoying though, using a mod like Narrow Minded may mitigate how often teammates receive this buff and will also extend the usable time between casts.

Electric Shield - A pretty good ability, able to block all incoming damage from regular enemy attacks (Directional) and will buff your weapons with Electricity if they shoot through them and provide a Crit Damage bonus. This will not combine with other elements the way Shock Trooper does, it simply adds electric damage to your shots. It can also be picked up by volt to be used as a portable shield similar to Garuda’s Dread Mirror, and will still provide the Crit Damage bonus and added electricity damage.

Discharge - This ability is what you would use if you want to use Volt for ESO for nuking the map. It also has the Capacitance Augment which will refill shields for you and your allies if you want to play a more support roll, although it does have some issues in how useful it actually is due to base energy cost and how prevalent shield gating is. It will also grant shields to objectives but the effectiveness is very limited and capped at +250 shield and will not give an objective overshields.

^{Hopefully this isn’t too long, my goal was to write a somewhat in-depth overview for any newer players/anyone that has never played Volt that may stumble onto this thread.}