I'm gonna disagree with everyone now... 
According to the FAQ, it says that you CAN move before or after an attack and not draw an AOO from that opponent. It says you CAN, not you MUST. This allows you to avoid AOOs from reach weapons when moving in to attack, attack and retreat without drawing an AOO, and maneuver around an opponent (into flanking position for instance) without drawing an AOO as long as you make an attack against the opponent during your attack action. This may sound like a lot of benefits for one feat, and normally I'd agree with that assessment. However, to do all of the above you must also spend 2 feats (on dodge and mobility) that IMO would best be spent elsewhere if they were not part of the spring attack chain. Also, a 5th level rogue with a maxxed tumble skill (8 ranks + 4 [dex] + 2 [synergy] = 14) would be able to do everything above except move before and after attacks at will. However, the rogue gets to avoid AOOs from all opponents, whereas the spring attacker only avoids an AOO from just one opponent. IMO, the feat as defined by the sage is balanced.

According to the FAQ, it says that you CAN move before or after an attack and not draw an AOO from that opponent. It says you CAN, not you MUST. This allows you to avoid AOOs from reach weapons when moving in to attack, attack and retreat without drawing an AOO, and maneuver around an opponent (into flanking position for instance) without drawing an AOO as long as you make an attack against the opponent during your attack action. This may sound like a lot of benefits for one feat, and normally I'd agree with that assessment. However, to do all of the above you must also spend 2 feats (on dodge and mobility) that IMO would best be spent elsewhere if they were not part of the spring attack chain. Also, a 5th level rogue with a maxxed tumble skill (8 ranks + 4 [dex] + 2 [synergy] = 14) would be able to do everything above except move before and after attacks at will. However, the rogue gets to avoid AOOs from all opponents, whereas the spring attacker only avoids an AOO from just one opponent. IMO, the feat as defined by the sage is balanced.