The variants are nice. They're not really my thing and if they were any other Pokemon like, say, Mightyena then I probably wouldn't care for them that much but Linoone and Zigzagoon are straight up my favourite things ever so I basically love them through sheer bias and association. I do really like how they implemented the stars into the design, the "star glasses" and shooting star are great. Only problem I have is the silly decision to make the Galar ones the supposed oldest branch species as that kind of shits on the originals but it's not enough to bother me.
As for Obstagoon, hate it. Probably going to end up as one of my least favourite Pokemon and I'll just stick to enjoying the other four. It's a shame because I do like some of the ideas present in it and think it was really close to being right, the cross motif is a decent follow-up of the earlier two, but overall the execution is horrible and the line was one that really didn't need any follow-up in the first place. It'd be like taking Ducklett and Swanna's ugly duckling concept and then adding a third stage - completely unnecessary and counterproductive to the theme of the line though a variant Ducklett that actually looks ugly would be nice