First off: I'm really sorry to whoever modeled it. This is in no way intended as an insult! It merely reflects my own opinion on the matter.
Having said that: I really, really dislike the Summoner in MWLL. It doesn't look like the real deal:

meh, better pic to follow once Pytak gets 0.4

Is it the texture? Maybe. But the proportions don't seem right either. It doesn't have that aggressive well-proportioned look to it :/
The legs appear too close together, are way too thin and lack the ankle of doom (same for Hellbringer). Why is the energy arm not the basic Omnipod that the other Omnis use but something slightly different? What's up with that shovel-rail of a ballistic arm? It's supposed to be a funny looking stump of LBX goodness, but what we have does look extremely strange.
Its torso elevation is severely limited. Yeah, yeah, it's a "chassis" limitation you say. But this makes the Summoner useless up close. Lights and many mediums just hug its crotch and can't be hit at all...
The armament is taken straight out of CBT. While I would normally appreciate that, it doesn't work. The LRMs are hard to use without the torso elevation. And really, mixed designs don't work well in general in MWLL. Why not replace the LBX with a 20?
Just wait until Amarus plays this...

x(