The only thing is the models did not come with the Death Ray weapons on the larger Tripod walkers (cruisers). I have asked for them to send the missing weapons, but have had not reply as yet. From what I have noted form a google search, I am not the only person to notice that the Death Ray weapons were not supplied on the Cruisers, but are displayed website example cruiser.
The rules look good, not over powered, and includes only 2 weapon types which have small or large variants. These can shoot up to rang band 3 or 4. The ships can not initiate assaults and can only be assaulted if you cause a breach in the hull. There is a separate CR damage table for them as well.
To download the PDf go to the Sparta Studios website.