Almost always the install, not the door. A slider that isn't set dead level binds in the track, and once it binds people force it, and once they force it the rollers and the weatherstripping give up. Then you've got a door that leaks air along the bottom every January.
We set them level, shim the sill properly, and adjust the rollers before we leave. It isn't complicated. It's just the step that gets skipped.
Two or three panel sliders. No swing space needed inside or out, which makes them the practical choice for a deck or a small dining area.
Wider multi-panel openings where you want the wall to mostly disappear. Usually a framing job as well as a door job.
Hinged pairs. More traditional, better seal, and they need clearance to swing.
Turning an existing window opening into a door means new framing and a new header. We do that work rather than subbing it out.
If the existing opening is square and sound, the swap is usually a one-day job. If the sill has taken years of rain and snowmelt, which is common on doors that open onto an uncovered deck, we may need to rebuild the sill before the new door goes in. We'll know when we measure.
No high-pressure sales visit, no commissioned salesperson, and nothing owed until you approve the proposal.
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