I got this one david 19 litre for £21.99
My stove is utterly useless, however by using the same techniques as before (spreading across two elements and using a camp kettle to reduce the surface area of the liquid) it was absolutely fine.
I would definitely recommend a larger pot over the 11 litre MB one. You can get a full 10 litres into the FV without a dunk sparge, or if you use the same technique as the MB kit you could get about 16/17 litres!
for me, the benefits are less mess, no sparge and greater volume. There are no downsides as far as I can tell. The pot size only feels a little bit bigger than the 11 litre (I actually though i'd bought the wrong size until I measure the capacity!)