as for performin better, what difference would i see if i where to use one of this bad boy feeds?
I've not seen a direct performance shoot-out between these feeds, however I've corresponded publicly and privately with a number of people who have done some form of testing between the available C-band feeds. The composite of this and published specifications leads at best to a coarse estimate of the relative performance of a wideband corotor with the dielectric inserted vs. the two single ortho feeds I used.
For the linear side, a wideband corotor without a dielectric plate delivers about 1 dB less CNR than single linear ortho feed. Inserting the plate causes a further 0.5-1 dB loss. On the circular side, a high-end circular feed like the ADL will outperform a single ortho with a dielectric plate by about 1 dB, and and that will outperform a corotor with a plate by another 1 dB. The losses are therefore between 1-2 dB for both sets of polarization.
Translated into other terms, let's say one has a 10' dish with a corotor plus a dielectric plate. A 1 dB loss means the dish will perform in CNR the same as a 8' dish with a single ortho feed. A 2 dB loss means the dish will perform in CNR the same as a 6.5' dish with a single ortho feed. CNR is important for C-band reception, but it isn't everything. Separating an adjacent orbital position 2 degrees away is also important and a 10' dish will do this the same regardless of the feeds listed here. Whether CNR is critical to your needs depends a lot on your viewing preferences. If you're after weak, near the horizon, high rate, high FEC and/or DVB-S2 signals, a better feed can make a big difference.