I've weighed in on this many, many times as an iCourier lover and previous Vulture user....heh.
Vulture is agile but lacks speed (understatement of the year; they're slower than a T6 by a strong margin) . This means you cannot easily control engagements and for all your agility can have issues getting to a nice spot for attack-and certainly won't sustain that spot. 2xC3 HPs are nice for punch but completely rules out any hope of a versatile setup, and without any C2/below racks it's not viable to use any explosives/rails. It feels...sanitary. There's no excitement in that cockpit, save for watching your weapons fire.
On the other hand it's remarkably
forgiving; you can turn easily with it, you won't lose control of it easily, it's reasonably durable, the power issues aren't a major thing if you engineer it or simply don't care for complex setups, and on stock thrusters you would literally struggle to add enough mass to start denting its agility. Without RNGineers in play, it retains max agility/speed possible even with MGC bulkheads.
...
iCourier: So far on the other end of the spectrum in so many ways. Forgiving outfitting? With a modded PE thrusters iCourier, you will want to shave off even small fractions of masses for the respectable results it will deliver. If you're into it, you can get maximum "roadrunner rating" by making loadout sacrifices to lose mass-though you can still just have as a fairly quick/bulky ship. You will prolly want to engineer it. It has heat issues when running hot weapons. It's not actually the fastest turner, though not unreasonable either. You will most definitely not be able to travel around with it, and get very familiar with the (cheap in this case!) ship transfer.
So why use it? Because a 700+ m/s lord of the trolls, with 3 slots for any weapons including rails/missiles, the smallest hit profile for any truly viable combat ship WITH the best shields for any truly viable small ship, really really knows how to embarrass the majority of enemies when flown correctly. With chaff up or dispersal field enemies may as well save their distributor energy and go into hibernation. If you choose to flee, nothing can hope to kill you without immense yet accurate alpha damage. It annihilates subsystems. You can make the loadout as specific to your flying style as you want. Oh and if you want to know how it feels to fly one...
In summary: For players who want to hit things every now and then but aren't interested in developing L337 skillz, Vulture is as perfect as it gets for casual win-a-thons. But otherwise....there is a reason I've never seen a PvP focused player in one.
Anyone needs iCourier loadout help, happy to assist.