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Are they genuinely good in the winter?
Probably not the 'best' winter tyre.... But imo probably the best 'performance' winter tyre. I am a summer bike vittoria enjoyer so dont want to compromise on performance too much. the gp5000s do last a lot longer than vittorias an offer marginally better puncture protection. I had some 4 seasons once and didnt like them... too rigid... got punctures with bits of flint in the gaps... didnt think grip was that much better...
Are they genuinely good in the winter? I've only recently bought a set for summer wheel duties. On the occasion that I've gone over some water on the road during climbs, I've then got a load of wheelspin. This has happened probably 5 times now. This has made me worry about their wet weather grip.
By contrast my wheels with Continental 4 seasons tyres is always so sure footed. Last week I pulled onto a mossy stone pavement, came to a stop, and almost fell right over as it was so slippy. Those tyres have really impressed me with their grip.