I have been seeing on eBay, at a lot of 30 to 50 year old bows (made in the 50's thru 70's). Some of them look as if they were never used. What are the differences in performance in new bows, with fast flight string, and the vintage bows with B50 strings? Are there any real advantages to buying a new bow v.s. an older used bow?(assuming of course that the vintage bow is "like new", no stress cracks, straight limbs,etc.). I can buy the same model Bear 4 months old or 40 years old. Whats the difference? And since I,m looking for opinions, whats your favorite old bow that's not made any more, and whats your favorite currently produced bow. Thanks.