T-Mobile 5G Home Internet & TP-Link Deco Mesh WiFi System (Deco S4)

I just installed a deco s4 3 units. Typically I have 4 bars on the gateway. The first unit installed at the gateway solidified reception on a tv 20 ft away and increased download speed slightly. The second unit installed in my lower level tripled my download speed and increased connection to full bars and "excellent" rating. The tv I have outside in the man cave adjacent to the lower level went from fair reception to very good and doubled down load speed. The third deco is in a back bedroom and increased coverage from 2 bars to full bars.
It’s early on but I am impressed so far