Ideally I would love to get a bloodtracking dog, but we have 2 dogs now, and the wife says one has to go if I do that. Naturally I offered up her little yapping Corgie, which got vetoed immediately. Which would mean I would have to part with my golden retriever, who's my buddy and follows me everywhere. So, the tracking dog is gonna have to wait. Unless I craft a plan LOL.
I would say I use the string tracker on less than 10% of my hunts. I've enjoyed a double string to a dead critter before, and I've also had it get snagged in brush and break off. Inthat case though, it was a ways dowmn the trail, and I had blood by then to assist. They are especially helpful in situations where you're not getting a lot of blood- high entrance with no exit, etc. Deer can often cover a good amount of ground before they start leaking, and if they are running full bore across an open area, graassy field or plowed crop field, you're in trouble. Tracks are great, but throw in a lot of tracks from other deer as well, and again the situation can end poorly.
I will say going back and gathering up 100 yds of string after recovering a deer can be a headache, but its important so other animals don't get tangled up in it.
I first started using one after a hunt in Indiana years ago. Heavy overcast morning, had rained all night. I got into my stand, and shortly after daylight I shot a spike buck, hitting a little far back, but still a good hit. He ran into this ungodly tangle of flora rose, they had tunnels through it. After the shot I hung my bow on the hook and prepared for the usual wait before taking up the trail . Literally within seconds of hanging up my bow, the skies opened up a deluge. No sprinkles to warn of pending rain. It just opened up.
I immediately got down from my stand and started looking, and while i had a bloodtrail, I was wathcing it wash away before my eyes. It poured like that for the rest of the morning, and we searched and searched, ut the buck had vanished into the tangle or thorns. My partner suggested usingthe string tracker,as he does when the weather threatens rain. I now keep one in mygear, and if rain is in the forecast, it goes in my fanny pack. I can throw it on my bow in a few seconds, and be good to go. If it starts raining hard, I go in. I dont like sitting getting soaked, and frankly I would have a hard time taking a shot in a steady rain anywy, knowing its not conducive to recovery of game. The tracker is kind of a backup insurance. Its not foolproof, but it sure helps in some situations.