A friend had his XD 45 done, and I think it shoots nice. I never shot it before the job, but it is crisper than my XD 9.
However, he was disapointed from the stand point of looking for more of a competition job. My thought is that since you are dealing with a factory thing that will stay within their legal and law suit defense criteria (bureaucrats and lawyers) it will never be as nice as a competition gun. However, if all you are going to compare it to is another factory gun, like I found, you should find it worth while.
Bottomline - It is better than my XD 9 and 1911, but not near my STI open gun.