Dr. Crawford also told me that there is no validity to the myth that 
horses get dependent on them.  I was especially worried about that aspect 
of it, and did not want a problem just in trying to prevent a problem!
the horse will be out in normal conditions, without the boots anyway, and 
unless you wear something all the time, the muscles do not get dependant 
on them.  
Please, I am only passing on what this research Vet said to me, I use the 
boots and am happy for the most part.  He told me that for a horse that 
has had any tendon or fetlock type injury, they are advantageous to use 
in endurance--from the research they did.   Just never use them if the 
horse is standing around.   
I condition without them some, and with them some.  I ride in competition 
with them most of the time now.  I have yet to have any problems occur 
because of the boots, but of course since I use them, I can't say that I 
have had any problems because I did not use them either!!  I have 
competed with or without them, and cannot honestly say if there is a 
problem one way or the other. 
I would go with what you use and unless you have a problem, don't change 
it.  
STANDARD DISCLAIMER:
I am not suggesting that anyone go out and purchase this product.  Only 
giving a different side of the story.  I use the boot, and I like the 
boot, but I don't think I will use them on all my horses.  I have an 
older guy with arthritis, and I use them to give him every advantage that 
I can.  I use them on my older mare for the same reason, but will 
probably not use them on my youngster that is coming along.  
samm c. bartee