They're very informative about what you need to build your decking when you ring up to order - how many joists and supports, how much decking, how many clips etc... but, when you call back a year later because the composite decking has curled and warped because the clips provided are terrible - they refuse to accept responsibility and claim it's an "installation error", even though you followed their instructions to the letter, "fit more joists and clips" they say, and then completely ignore you. "can i have more clips?". no answer. Best avoid eDecks, and best avoid composite decking IMO.