[time-nuts] Thunderbolt?

[Peter Gottlieb]

I am interested in increasing my lab accuracy from the Rb units by using 
a Thunderbolt.  I see kits advertised on feebay, such as

http://www.ebay.com/itm/270515147719

and I was wondering if this was a good choice.  I would certainly have 
to get a compatible antenna anyhow, and the power supply keeps me from 
having to dig through my storage to find one.

Is this a decent way to get set up or are there better/cheaper ways?

TIA,
Peter