Are the Speedgoat 6s really that terrible?

Hello! Looking for people's thoughts on the Speedgoat 6s. My Speedgoat 5s are coming to the end of their life and I've got a 50k trail race coming up in a few months (in the UK, so probably a combination of muddy / rocky terrain). I'm reluctant to buy a new pair of Speedgoats, given how much negativity I've seen about the Speedgoat 6s (and the fact that I can't find any 5s in my size). Are they really that bad? Tbh I can't really be bothered trying to find an alternative but am alarmed by people saying they're really rigid and uncomfortable. I've also been considering the Hoka Challengers as a road-to-trail option, but not sure if they'd be up to the job for my 50km trail race (and can't afford to buy two pairs at once!). Thanks in advance!