I'm too OCD to use the guide holes but I've used these on three decks and they're great as spacers. In the past I've simply made wooden spacers and that works fine but these jigs...
Don't fall through the deck
Are light and won't damage the wood -- I throw them down the line to where I need them next.
I sometimes just use the spacer portion which I can carry in my belt.
Straddle a joist so two butt ends can be lined up with one operation
Are easy to spot due to their color
Are pretty cheap. I bought 4.
A+ product. I recently rebuilt my 25 year old deck and purchased a set of these spacers before attempting it. They made the job a lot easier and the finished product was a nicely spaced deck with very evenly-placed screws. I wouldn't have been able to do nearly so well without it.
I do not say this often, but if there were six stars, I would give that rating. This has got our deck in, spaced right, the screws in perfect rows and it looks fantastic! My wife joined in helping out and in short order, she was a sinking screws like a pro and because of the jig, all of her stuff lined up with what I had done and vice versa. You cannot tell which boards she did or I did and this is the first deck we have ever done and it looks near perfect.
I used this to face screw my 16 X 12 deck. Although it did help with straight lines you have to be patient and center the screws in the quite holes or they will be a little off. I marked the holes with black marker to keep me from using the wrong screw hole. Was worth the $20.00
This Jig is not perfect, but it definitely helped give my deck a more professional appearance. My only criticism is that for butt joining boards, it was hard to see where the joint was, thus they can be off a little. But in all, I'm glad I spent the few bucks to give my deck a more professional appearance. I'd recommend the jig rather than eyeballing the screws/nails.