Yeah, I used their FATPIPE product on their own backbone.
I also don't use more than 300GBs a month, but hard to drop uncapped. Even though business uncapped costs more than what a capped package would cost me.
I considered getting a 50GB account in month 1 and not use so it rolls over to month 2 where I would upgrade it to a 300GB package. That way I would have a nice "buffer" always.
That is coincidentally almost the exact plan I had