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It does indeed suffer from the lack of an invul save. It also lacks a few other features of most knight class models, such as flat 6 damage attacks, and stomp attacks for dealing with infantry. Plus it degrades quite harshly.

The upside is that it has the Tyranid and <Hive Fleet> keywords, so there is a bit of synergy with your armies rules.
For instance you can Catalyst it, or make it move twice using the swarmlord.

Overall it's not amazing, while still being usable.
I don't bother using it much because I can get better stuff from the codex. In my experience it rarely disappoints, it just rarely excels either.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/756629/9969882.page http://www.dakkadakka.com/dakkaforum/posts/preList/756629/9969882.page GMT
As part of a Nidzilla list with other mostly large gribbles the situation may change whereby gribble here allows the rest to live longer.

does need a screen to keep nasty combat units at a safer distance though]]> http://www.dakkadakka.com/dakkaforum/posts/preList/756629/9970185.page http://www.dakkadakka.com/dakkaforum/posts/preList/756629/9970185.page GMT FW will revise and release their books? I’d love to see some consistency with their models. For instance, it makes no sense that the Dimachaeron doesn’t get a tail attack. ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/756629/9971922.page http://www.dakkadakka.com/dakkaforum/posts/preList/756629/9971922.page GMT Forgeworld tend to only release updated rules for old models either when an edition change forces them to, or when they are expanding a model range.
It could be years before they get back around to tyranids.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/756629/9972924.page http://www.dakkadakka.com/dakkaforum/posts/preList/756629/9972924.page GMT