I have 508A, 607A and 811A. Liked the 607A but was very condition sensitive. Tended to use when lanes started drying up. Do not care for 811a. Very unpredictable for me, but I have not tried surface adjustments yet. Now the the 508A I love. I have same layout as 607A and it is my first ball out of the bag. Use it on fresh THS at one center and second shift shot in another center and have no complaints with this ball. Seems to read mids a little better than my 607A and stronger but more predictable than my 607A. (508A layout is: 60 x 4 1/2 x 40)
J. Helton
Perfect Approach Pro Shop