I purchased this Shark steam mop about 4 years ago and didn't like it because the water reservoir was to small.  I put the mop in my closet and it sat there.  I finally took this mop out and used it and fell in love with it.  The small water reservoir didn't matter.  This mop did the job.  And I had little clean up after the job was done.  Time saver!!  My problem now is the unit won't lock in place.  I have only had the handheld steamer unit off a couple of times and now it won't lock into place.  Am I not placing the handheld steamer unit in proper alignment with the handheld steamer housing?  I'm being very careful to make sure the handheld steamer unit is in proper alignment with the steamer housing but the steamer will not lock into place. Or is my problem a defective locking system?  It's a shame my Shark Lift Away Pro Steam Pocket Mop didn't last very long.  I'm considering getting another steam cleaning machine but it won't be a Shark.