Good first road bike for commuting? (And a sprint triathlon)

Here’s the description:

2006 Rocky Mountain Solo 50ac – 54cm Medium Size frame. This bike is in excellent condition and sub 20lbs. Aluminum frame with carbon seat stay, chain stay, fork, and seat post. Full Shimano Ultegra components. Mavic hubs. 2 x 10 Speed. Fully tuned and ready to ride.

It’s going for $300. Seems to be in great shape from the photos. Thoughts?