Finish Line Dry Teflon-Plus is my go to lube for the dry climate here in Colorado. This is the cleanest running longest lasting chain lube I have found for dry sometimes dusty conditions. It holds up OK in wet conditions but if I were riding constantly in rain I'd look for a longer lasting alternative. BTD has the best price on this stuff especially on sale. I do not like the child proof top they instituted a recently because I have had tops fail before the lube was used up.
This is the only chain lube I use anymore, and I use it year-round. The caveat is that probably 23 of my 4000 or so miles each year are indoors, on a trainer. So, environmental conditions aren't very challenging, compared to those who ride in drydustywetmuddy conditions outside. The reason I love it for indoors is that it doesn't spatter off and throw black streaks all over my trainer or the mat beneath it, like several other chain lubes have done in the past (even after a wipe down upon every application). My chains have lasted much longer than expected, as confirmed by my handy-dandy chain tool, so I think this product does a fine job of extending chain life.
First off, I probably log 80% of my 3,000-3,500 annual miles indoors on a trainer, so I'm not exposing the drivetrain to really challenging weather (other than the 95% humidity of the pain cave in a longer session). In those admittedly benign conditions, I really like this product. Many others, namely ceramic-based lubes, have produced a black liquid splatter after some use that eventually makes its way off the cassette and chain onto my trainer and the surrounding area, which is no good. This stuff works and keeps the area clean, as far as I can tell.
This is my standard day-to-day lubricant. I re-apply it every week or so, depending on the weather. Keeps things quiet and slick. It's very low viscosity, so it can be a challenge to get hard to reach areas without making a huge mess.
This is my lube of choice because here in Colorado our climate is mostly dry. It will hold up to wet conditions too but there are probably better lubes if it rains all the time where you are. Most of our local bike shops recommend Finish Line Dry but BTD has the best price.
I live in the Seattle, WA area and ride year around in all weather conditions, Dry Teflon lubricant works as advertised. I clean my chain about every 200 miles, (2 weeks of riding) then dry the chain and apply Dry Teflon lube. Quality product! You won't regret putting Dry Teflon lube on your bike chain.