3 years on still loving my gravity rig....33L HLT, 33L mash, 60 L kettle, turkey burners under each, and a gas manifold so they all run off one gas bottle.
Can knock out 46L in 4hrs or 2 x 46L in about 6 hrs. No pumps, no electric.
Wanted a Blichmann but a bit expensive so made my own...