I generally have been stringing polys at 48-56 lbs -- decided to try low 40's.
I found the string bed felt duller and less responsive and bothered my arm to boot -- tried this with a couple of polys.
Don't know if this was addressed in this thread earlier, bit I am curious to see if anyone else had the same experience.
I started out in the 60's and some at 70. I started dropping at the suggestion of my coach.
I liked the initial drops into the low 50's, but when I got into the 40's, I had some control issues, and my forearm tended to get a little sore. In short, I didn't like it. It wasn't really too bad, but I didn't see any great advantage over the low 50's I had worked down to.
I was about to give up when I came upon this thread. I went into the 30's and found what a lot of people here have found. I liked it. My control started to return, no more arm soreness, and my strokes actually improved. Plus I started getting a lot more spin on the ball.
When I dropped down to 30 (which was the original intent of the thread) I found lots of power, spin and control. My service speed had dropped off a little when I started lowering my tension, but once I got into the really low 30s and at 30, it picked back up. Maybe it was just needing to get used to the lower tensions, maybe the middle tensions (40's & high 30's) aren't ideal for the way I serve.
To make a long story a little shorter, I absolutely love the ELT. Not the middle of the road, a bit lower than "normal" tensions, but the extreme low range. I tried several different blends in the mids. They all lacked what I was looking for. But when I got down to 32 and 30, I found a new weapon.
Everyone's experience is going to be a little different due to racquet choice and playing style. But I would say that the people going down into the 40's are missing the point of the experiment. Until you get WAY down in the 30's, you are not experiencing the effects of ELT.
In other words ... GO FOR IT!!! Jump in with reckless abandon. Do a great big cannonball. Don't wade into the shallow end of the pool up to your ankles and decide that swimming isn't for you. Have some fun.
Like Cole Porter said, "Do what all good scientists do ... EXPERIMENT"!