XGS-PON ONT prices are a lot higher than GPON ONTs. They often draw a lot more power, as well. As long as you do not have a rate > 1 Gbps, you can use a GPON ONT, because XGS-PON is mostly downwards-compatible. In Germany, there are only a few ISPs who already offer XGS-PON - we sometimes use to call it "digital diashora".
In theory, one could have up to 2.5 Gbps downstream over plain GPON, BTW.
In theory, one could have up to 2.5 Gbps downstream over plain GPON, BTW.
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