Our ears are I guess all different, but my Klon is what I use at least 95% of the time when I boost my amps of my 10 overdrive pedals and 2 rack PQ's (have been through over 140 boosts over the years). I've AB'ed it with tons of Klones (KTR, RYRA, Mjolnir, Tumnus, others I can't remember the names of) and it was to me like comparing premium fresh squeezed OJ to the made in concentrate version. Same flavor/voicing/eq curve, not the same quality. Whenever I helped my friend with his re-ampings the Klon would consistently be the only boost that would make the cut for him. We AB'ed with his RYRA and he thought they sounded more or less the same (I didn't), but somehow in the re-amping process the differences actually became more pronounced (I don't know much about recording) and so he only used the Klon. I was quite happy with my KTR until I AB'ed with an original silver and then it sounded comparatively brittle/clinical and so I listed the KTR on reverb the next day haha. I paid $1550 for mine, but it has sent way more dollars worth of pedals packing I've had over the years than that. For me well worth it, wish got more in retrospect, but guessing most others will disagree or think I'm a cork sniffer or whatever lol, but I will say I definitely hear a bigger difference with the Klon to other pedals vs holy grail tubes vs generic, not great tubes made today, but all just my opinion