Have been renting these from on many occasions from the same company until decided to bet a pair myself. They have proven to be very well built and being able to withstand use and abuse in various conditions from small conferences to outside events where they ahve been tortured at stupid levels as fill-ins.
The sound is good for the size and price, can't complain there. The only downside is the inability to mount them on speaker stands straight out of the box. A lot of guys have modified the included mounts by welding a piece of pipe to them for this purpose and I have seen some guys putting in a screw at the botttom of the speaker cabinet, so that they can be mounted on heavy mic stands or studio light stands (fairly stable and space efficient solution).