I think its a decent product. I've been using it for a few years with no problems. From what I read on the net if the wood is prepped the right way, the stain should last between 4 to 6 years depending on the elements.
I used to measure the balusters a long time ago but it took a long time to figure out all the different measurements and left room for error in the customers favor. After years of estimating decks you can just look at a deck and get an idea on what its going to cost the customers to get it done without measuring it. Say if you have a $600 deck and the deck measures 10x20 then you know you need to charge $3 a square foot ( balusters included). I hope this helps you.