used Zipp tubulars??

A friend is getting rid of a bunch of bike stuff and has a pair he wants me to buy. I am a recreational rider (average ride is 25 - 30 miles at 14-15 MPH) and ride a specialized rubaix with what ever wheels came standard. I am a little overweight (5'8", 200 #) so hills are challenging. The wheels are really light, though they are tubulars (no experience with this) so I am wondering if this would be a reasonable investment for me? He didn't specify a price but said to check ebay and he would be way below that - so I am thinking $3-400 for both - did not look at back sprocket so that might need to be changed. Thoughts? would you do it? Pros and cons?

Also said he had some power meter stuff (hub mounted)- too exotic for me.

Len