I just had a collections account removed through a dispute (Mod cut - not here per Credit Repair Discussion Guidelines) only TU and saw no increase in my score for that beuru. My utilization is at 14% so I figured once I got that removed it would go into the 700s but it stayed at 680. I'm still thrilled though one less reason to get denied lol and figured I should report my success and I definitely recommend credit repair to anyone with collections.
Do you have any other negative accounts? It has been my experience that getting one negative item removed while still havings others has a negligible impact on scores. For example, I got a debt buyer collection deleted recently from all 3. On EX my score went down 5 points, but EQ stayed the same, and TU went up 20. TU had only 2 other baddies, while EX has 6, and EQ has 6. I think you stay penalized to some extent until your file is completely clear of negative items. Either way, you are making progress towards that goal!!!