Quite to my surprise, I have heard (well, read mostly) a fair bit of folks who are upset with the appearance of the new Grey Knight squad box. A large part of this seems to be due to price. Yes, they will be $33, but so are Sanguinary Guard and Death Company. There are only five to a box, but ditto. I think this is not a well thought out objection, considering just how many goodies come with these fellows. Is it possible to buy a box of Grey Knights and a box of Tacticals and make three squads of 5 Grey Knights? I don't know, but I bet people will be trying it out come April. I might do something like it myself, depending on how suitable the pieces are for kitbashing into Deathwatch Marines.
So, in summation, I rather like the new Grey Knights. they come with oodles of conversion possibilities, look pretty cool, and make the GK more cost accessible to those of use who do not want to go with an all metal army.