All this data is potentially out of date, and should be taken with a truckload of salt
Prowler as a blockade runner
The prowler is one of the best blockaderunners around. It does lack in cargo space compared to other blockaderunners. However, it has a lower signature radius which will buy you some time when you need to warp fast. Being a minmatar ship it is also the fastest hauler ingame with the best aligntime. This makes the prowler perfect for hauling small yet valuable cargo.
More importantly, it is the only transport ship having two high slots which allows the pilot to equip the ship with one more highslot module after fitting the covert ops cloaking device. This utility highslot makes the Prowler the best choice for wormhole operations giving it the ability to fit a Scan Probe Launcher in addition to its covert ops cloaking device.
Below are additional ships images. Click the image below for a larger version: