I'm not familiar with the company you mentioned that did the work, so this is not a direct slam on them. However, some companies will knurl the existing guides when they do a "rebuild". That's one of the ways to build down to a price rather than up to a quality standard. Knurling is a short term "fix". You might either ask if that's what they did, or, since you need to replace them anyway, just look to see if that's what was done. Unfortunately, if that's what they did, they may have taken other shortcuts too.