Not exactly sure what your asking but here goes.
The Amrosia is BlueCon which effectively will sit on top of a Freestyle Libre sensor and turn it into a CGM, so will transmit data to your phone every 5 - 10 minutes, I think.
So you would buy your Freestyle Sensor then buy the Amrosia and then use their phone app or a third party one to get the info you want. The Libre's last two weeks but the Amrosia would be reusable.
Yes they are good as is the Free Style and MiaoMiao combo which does the same thing, there are a few on here that use either one and are liked.