pocket doors can be very polarizing choice. We did an entire house with pocket doors to save space in the bedrooms and baths. I don't know the brand but I am very pleased with the quality. The doors are solid wood and the tracking has held up to hard use. These doors are in a weekend house that gets lots of teen and young guests that are HARD on everything. I will ask the contractor about his source.

Be aware that pocket doors will restrict use of the wall space behind the pocket. you can't sink long lags into the pocket area to hang heavy items like tv brackets, some shelving, etc.

Soundproofing? This is something you may need to compromise as the doors are slightly above the floor as they need to glide over the flooring. Adding sweep to a pocket door might not work.

Consider Cavity Sliders: Here's a video: https://video.search.yahoo.com/search/video?fr=mcafee&ei=UTF-8&p=cavity+sliders+the+build+show&type=E211US885G0#id=1&vid=35f784bbd1d36ae3f7e976f9f8819f30&action=click

You need good quality slider hardware (architectural grade slides easier than builder grade) and high quality solid core doors. Two separate decisions to make it work well.

Back in the day, pocket doors were not only suspended from the top of the doorway, but they were also on a recessed track in the floor. That solved a lot of issues common with today's doors, especially the barn door style. I would find someone who could provide that kind of pocket door and installation.

The best pocket doors have hinges and swing into a room usually up against a wall.

Another thing on the sound proofing is that the wall the door slides into, will transfer sound from room to room. It is an empty space, when the door is in the closed position.

Bedrooms and baths are ideal for pocket doors …even more so if the pocket door adjoins a walk-in closet..where sound is no issue