I don’t normally get involved in these threads but do enjoy reading them…
Anyhow, I do kind of get what Hora means about aesthetics; some bikes look poo in bigger sizes. It’s one of the reasons I bought my Rune instead of the Covert. The large Covert looked like a gate, whereas the medium looked ace. According to the geometry chart, at just under six foot, I should be riding a medium Covert but the top tube was teeny and felt way too short.
Having ridden mediums fir years, I’m glad I’ve gone up a size. My Rune in large fits so much better than my SX Trail which makes riding it much nicer.
Hora, as your taller than me, you’d be mad to go for a medium Heckler…those top tubes are for umpa lumpas.