Honestly I'm not a huge fan of mantics sculpts. I find the units very monopose and even the individual sculpts don't really grab me. There's some great units, I love the cthulu looking guys, but overall I wouldn't go out of my way for them.
I feel the same about most of the range to. I did the mantic kickstarter a few years back and got a big dwarf army. Dwarfs have long been my main fantasy army, but I just can't get enthusiastic about the mantic ones. Pretty sure I still have most of them on the sprues, which is unheard of for my warhammer.