Yes, the service we get here is much better than we had in California (Silver Strand Beach) and much less expensive.
All we know about the installation is that it was scheduled, they came and said with our three story concrete house we needed three routers and more work. When we asked how to arrange it the TelMex installer said he could do it. $1500p later we had three beautiful installations, all three routers named appropriately, modem on the roof and great service, all for one low price.
A year later when we had a broken fiber optic cable diagnosed by TelMex "somewhere near by" they said it would be 5-10 days for repair. We called our installation guy and for 500p it was located and repaired within 2 hours of calling him.
Sounds like you have found the answer for your sister that should work well!