if you're not grinding your own beans I wouldn't bother, to get decent results from a bottomless requires trial and error and a decent technique and buying all your coffee ground at a single fineness means if it's off for that bean/roast you'll have a bad time with the whole batch. especially as it changes as the coffee gets older.
edit: should probably clarify. by 'results' I mean the pour coming out as a stream, everything else would be the same regardless, you just wont see it with a spout on the portafilter.
if you're not grinding your own beans I wouldn't bother, to get decent results from a bottomless requires trial and error and a decent technique and buying all your coffee ground at a single fineness means if it's off for that bean/roast you'll have a bad time with the whole batch. especially as it changes as the coffee gets older.
edit: should probably clarify. by 'results' I mean the pour coming out as a stream, everything else would be the same regardless, you just wont see it with a spout on the portafilter.