Does this change logistic bots or roboports?

No. It only adds a personal GUI for monitoring item counts in existing logistic networks.

Can different players have different grids?

Yes. Grid setup is personal per player.

How many grids can I create?

Each player can configure up to 8 grids. Each grid can be sized from 1x1 to 8x8.

Does it support quality?

Yes. Slots use Factorio's item-with-quality picker.

Is it performance heavy?

It is designed to stay light. Counts are refreshed only for selected items in visible enabled grids, using the configured refresh interval.