I purchased the Conversion Beamer set from Chapterhouse Studios a while back and mounted it on my Ultramarines Techmarine (which I guess makes him the head guy). Note that I am not going to use this as a forum to rant about their legal issues with GW.
The set came on the sprue pictured below. There was some flash (sarcastic gasp) which anyone who has ever molded their own product will tell you is an inevitable byproduct of the process but their molds went together well and there were no bubbles.
My only complaint is that on their website, at the time I assembled this model and at the time I am making this post, there is no picture of how it should go together. When you understand that what you see is your choice of two different backpacks, assembly is then fairly obvious but it took some head-scratching to finally figure it out and a picture is worth a thousand words as they say.
Here is my assembled product mounted on a recycled techmarine, you will not I used one of their shoulder pads as well:
The kit is flexible enough that you can do a number of poses with it and the resin glued together nicely (as resin tends to do). I did clip off the edges of the servo arm; one of mine was bent (accidentally by me) and any attempt to fix it would have damaged it beyond easy repair. It is a great kit and rather than throw out some arbitrary system or rating I will merely say that I would recommend it to anyone who does not want to do up their own or use the one from Forge World.
Here is the finished product as well as the command squad I knocked out this last fortnight (as the speakers of the Queen's English would say):
And the command squad, not happy with how the white turned out: