Julian Evan-Hart said:On this site I had conducted nine previous searches with an E-TRAC (FBS technology) which recovered 190 coins. After the finds rate decreased I considered the site to be pretty much exhausted for this year. Switching to the CTX 3030 (FBS 2 technology) proved me somewhat wrong. A second series of searches revealed another 214 coins. The results are shown in the following table. One other consideration is that these 214 coins were found in rather less time than the 190 coins with the E-TRAC.
http://www.minelab.com/usa/treasure-talk/so-is-fbs-2-any-better-than-the-original-fbs