Here are some of mine, I do have others, just not worthy for this esteemed thread. Then again, these aren't exactly "write home to Ma" straps.
From top to bottom we have:
Kliq strap - Comfortable, but not enough to get me to use it daily. Don't like the plastic bits to adjust strap length.
Anthology - Walk The Line - Whiskey Brown Leather Guitar Strap - B-STOCK (never could figure out why) - Got a great deal on this one and it is my favorite strap. Using it for my Martin J-40 these days as it is too long for what I want on my electric fiddles.
Peace - Got this one in late 1990's and it was my main strap until about 3 years ago. Now it is used exclusively for my Hwy 1 Strat (which gets very little play with 3 PRS now in the house).
Custom Moondog Wily strap - Had this one made by a guy named Nick in New Jersey. Paid way too much for a strap by someone who does not follow directions on a custom order (he did say he would make me a second one, no charge, and then ignored multiple emails asking when I would get it, that was 2 years ago). I could not believe how many strap makers did NOT want to make my custom strap (including Couch). I have been using this one as my daily strap on my PRS McCarty 594 HBII for the past 2 years now. It is ok, but for my heavier guitars, I can only last about an hour using this one.
Levy - I use this exclusively for my MM Stingray bass. Very comfy. I think Gator owns Levy's now. With my Stingray being around 10lbs, I need this wide strap and it has a descent amount of softness/padding to it as well.
I have set a limit on guitars that I buy to be <8 lbs as anything heavier I can not play for more than 60-90 minutes. My daily guitar (PRS HBII) only weighs 5.6 lbs, so I can wear that one all day and have no issues. My two CU24's are 7.2 and 7.6 lbs and they get limited time on my shoulder in part because of weight (I know, weak bastid is me). Just about two months ago, I purchased a harness strap system (not in pic) but I have not tried it yet because after receiving it, I realized that the system could cause some issues on the finish of the guitars I want to use it on. I will keep it because I have other ones I have no problem using it on, have not got around to trying it yet though.
I have heard really good things about Red Monkey and Heistercamp, but have never tried one. I do know that they are pricey. Looking forward to checking out what others are using!