For the rpice it looks quite good .... I would pay quite a bit for an old 5800 rim brake gruppo .... I am a little concerned about tire clearance .... looks like 25s is all it will take, and I am assuming those are older, narrower wheels, seeing as all the parts are older .... but if the bike is under 19 pounds and under $1200 it seems like a good deal. For smooth pavement I;'d say yes it is a good deal. The group set and wheels alone are worth a good bit, and the frame is not porky ... if the listed weights are accurate.
Make sure the frame fits you ....