Sentence:  With nearly no moves easier than 5.8 or harder than 5.10a, and with no rest ledges, it is heaven for 5.10 climbers, as long as you bring a <WSD>butt bag</WSD> or a comfortable harness for the hanging belays. 
Meaning of the word marked with <WSD> tags:  A seat attached to ropes on which a climber can sit while belaying.