Long range USB extender (over ethernet)

[mrbios]

I've got two situations i need to use these in, but there seems to be alot of variations ranging from £5 for a pair all the way to £100 for a pair, I want to buy something reliable rather than a piece of tack so has anyone used these before?

 

Purposes:

Phone PABX that only has USB, at least 60m away

iPad trolley, about 30m away x 2

 

Any recommendations on what to buy for this that will be reliable? Does the USB speed suffer went sent through these things at all?

[catch21]

Are you talking USB over ethernet or USB over CAT5e cable?

[mrbios]

Sorry, poor wording on my part, i just want to extend over cat5e. I'm just not sure how reliable or how fast it would be?