Everything works (one of the RS800CX watches has a broken wrist band so I bought a second). I've included everything you'll need to hook it up to your bike and wrist to give you lots of metrics. Training with these metrics can really help and the power is especially nice to have. The power units currently for sale (without watches) can top $2000 so this is the much more reasonable way to obtain the same information. You'll need two AAA batteries for the power unit and a AA battery for the GPS unit. Everything else has button batteries, which are included but are not new. 

Total investment in all these devices exceeds $1,200!