Actually removes quality related things from the game (unlike the no-quality mod which simply hides them). This allows you to place with the recycler and space-age without quality.

There are various options (which are on by default) to only remove some quality related things:

• Quality Levels: removes the quality level's themselves, preventing you from ever having a non-common item/entity

• Quality Modules: removes the modules, so there won't be a way to actually make anything quality without using commands, the editor, or another mod

• Quality Technologies: the technologies in the tech tree for unlocking quality levels & modules will be removed, requiring the use of commands/editor/mod to use the qualities or modules. If this setting is not on, but you've removed the quality levels/modules, the technologies will still be researchable, they just won't be useful.

• Quality Tips & Tricks: the tips & tricks about quality will be removed. If this option isn't on, but the option to remove quality levels or modules is on, then the tips & tricks are edited so they still work (although they may not actually be helpful, or unlockable if you haven't already unlocked them).

• Quality Achievements: removes the achievements that depend on certain quality levels and/or modules. If this option is not on, but the option to remove quality levels and/or modules is on, then the achievements are modified to be granted with normal quality and/or productivity modules.

Unfortunately, to fully remove quality the quality feature flag must be off, but it is turned on by the quality and space-age mods, and there is no way to turn of feature flags. However, if you are willing to edit the files in your factorio installation, you can remove the "quality_required": true, line from data/quality/info.json and data/space-age/info.json.
There is also an option in the mod that will cause the game to fail to load if it detects that the quality flag was not disabled.

Disabling the flag will remove the following extra things from the game:

• The quality diamond tooltip in Factoriopedia (if you have the 'Remove Quality Levels' option set, then the diamond is invisible, but I cannot disable the tooltip)

• The quality related options for the selector combinator

• The quality selection list in the editor (it will be an empty list if the 'Remove Quality Levels' option set, but that won't actually remove it).

• There may be other things too, I'm not sure.

Note that disabling the Quality feature flag will force the 'Remove Quality Levels' option to be on, or else the game won't be able to load.
If you want to re-enable the flag, you can just enable the Enable all Feature Flags mod, without editing the game files again.