4.5/5 stars, rounded down. Great rules!
An unseemly tool that wasn't seen much until the Heresy. This is scout class knight able to mount otherwise restricted weaponry. Their pilots were accordingly lesser and expendable in the grand scheme of things - tainted slowly by the otherwise radioactive poison of these machines.
Excellent customisability is standard here. If you want something to cut through space marines, then I strongly recommend the lightning locks. Or maybe sit back with the conversion beam cannon? Or what about a double siege claw for close combat?
With 6 wounds at T=7, these knights are relatively fast and can be a pain to almost every enemy who will have to choose them or a bigger target. Take several in a talon to improve your odds.
Arguably WS=BS=4 is not so fantastic here, but it will certainly serve its purpose well enough. Ld=8 is a problem. The Greuso Protocol is an interesting advanced reaction that you will also see players take advantage of from time to time, so its not really bad at all and I'm just pulling out a few things that stand out to me.
4x Moirax, all with 2 Lightning Locks (820 points).
Pretty rude, but will absolutely deal with large blobs of power armour opponents.
2x Moirax with Conversion Beam Cannon (420 points).
Two hits from the conversion beam cannon at maximum range is deadly. Even mid-range is going to have the same effect as a las cannon in terms of raw strength. Hang in the back field and take down those enemy tanks swiftly. Take another 2 just to make sure the job gets done either here or in a distinct unit?