D ave, I took a set behind boat on the bob, i rode the 137? i think, so a bit smaller than the 139 lyman I rode. They are not even close in my opinion. The bob is not fast and loose like the lyman, but it is a sick board for sure. I loved the lyman, then I tried the 140 witness and was hooked. I just picked up a 2013 witness for super cheap, wakesports unlimited (wakesports.com) have them for $299 and I think "wakeworld" has a promo code good for %10, so it comes to about $309 delivered to your door in 2 days.
Definately try to demo the BOB and witness if you can before you buy.