Product review (4 stars): Be safe.  Use LintEater.
LintEater with the extra extension kit worked great to clean our 25 ft of dryer vent.  No, there is no way to vent it at a shorter distance.
It was difficult to feed it from the outside vent opening.  We ran it from inside the basement.  The extensions came apart two times when the drill was in reverse  mode used to back out the LintEater.  It was necessary to splice into the vent to retrieve the detached pieces.  Duct tape to the rescue.  It appeared we had the extensions fitted together tightly.  It would have helped if the fittings had a flat side on the female end for a better grasp when tightening the extensions.  Perhaps we should have just pulled the unit out of the duct instead of using reverse on the drill while walking backward.  Maybe that info was in the instructions.  Hey, did you kids see the instructions?  Have someone hold your vacuum cleaner on and aimed into the vent opening while using LintEater or the dust will choke you.  To avoid a dryer fire I highly recommend this unit. In fact, two days after I received this product in the mail there was a news report of a house fire which started in the dryer.  LintEater was recommended to me by the appliance repairman who cleaned the vent the last time.  Buying LintEater was cheaper than calling him again. :)