I've been using Boeshield T9 for years! It doesn't seem to attract dirt and keeps the chain running smoothly. (It was originally developed as a lube by Boeing. Guess if it's good enough for them...)
I commute to work. Sun, rain even a bit of snow. There's always grit, gravel and road debris being kicked up into my chain, gears and hubs. This lubricant works great. I've tried others, but nothing compares to its lasting power and ease of application. I've trusted T9 for seven years, 16,000 miles and wouldn't use any other.
I've been using this chain lube on my bike now for over a year. I like its consistency. It does attract quite a bit of dirt which means for more cleaning overall, but that's something that should be done anyway. When I've just lubed everything...it's like butter. Also, despite the increase in re-lubing, I still haven't used my first bottle...over a year later.
I use T-9 every few days on my chain and other bike parts and then forget about it because T-9 takes care of road dirt and drying out of cables and other parts. I have used it for a long time and this small container is easy to carry and handy to use on long rides or tours. I love it.
I've been using this for 3 yrs now and really like it. Wiping down the chain and relubing with T-9 (& wiping off the excess) keeps the chain quiet with little dirt accumulation. I lube the chain at 100m intervals and at 5000m the last chain never got to 0.75% on the Park CC-3.2 chain wear indicator. I changed it anyway as part of the annual maintenance ... so no telling how long it would have been before the CC-3.2 would have detected any chain wear.
Over the last twenty years I have used many chain lubes including some of he so called high tech ones. I ALWAYS come back to T9. If is good enough for Boeing, it is good enough for me and my bike.
Sure, you can bay 50% more for Dumond Tech, but it's not any better. T9 is expensive as well, but I use it on all my campag chains. Used daily as a degreaser first then lube after really puts life in the chain, I get 4-6K miles out of a chain that's only supposed to go 2-3k. It also works great on small parts like bolts (let some dry on your bolts after you tighten them and it'll make sure they don't rust).
I live in a dry & dusty climate and ride about 4k milesyr. Lubing the chain 1wk has kept the crank, chain & cassette clean and quiet running. When wiped after lubing, the result is a clean chain that attracts little dirt during rides. Also, after 5k miles there was still no wear measured by a Park CC-3.2 chain checker!