I think If i were to be looking at freewheels around £50 i would save some money and go for an Echo TR, my echo SL has been awsome, I was realy worried due to having a chris king rear hub for over 6 years! but the SL realy is an awsome piece of kit! Ignore Rusevelts post, that is the only SL that I have heard of that has cracked and from what I have gathered it is because it was hit very hard.
So yeh, If you don't want to fork out the money for an SL, go for a TR pretty much the same freewheel just with a few less engagements, and lets be honest, 72 is more than enough!
Adam