I've used these off and on over the years.  They are more suseptablde to 
rf in the shack. At least in my experience.  I had one up for 160 through 
ten fried the ballon last summer with my alpha, but I could never get the 
swr down on 160, no matter what I did.  It worked fine on 75, but on 40, 
same high swr problem.  It was resonant at around 1700 kc and nothing I 
did, shortening both ends didn't change much.  It is worth a try and a 
good compromise antenna for all bands.
73
Butch
WA0VJR
Node 3148
Wallace, ks.