Most of the clubs who have done a lot of business look to be a bit of a mixed bag.
Alisson, Keita and Shaqiri look like good buys but I don't think Fabinho will be. I like Bryan, Mawson, Fosu Mensah, Mitrovic and Seri for Fulham, but not sure about the likes of Vietto. Everton have been ballsy with Richarlison after he faded so badly last term, not sure about that, but I think Mina and Digne are both good buys. West Ham have bet on Anderson and Yarmolenko who could both do really well, but also inexplicably bought Carlos Sanchez. Arsenal got Torreira who could become very good, but not sure about Sokratis and Leno, both look Europa standard to me. Wolves have got a quality keeper in but not sure at all about some of their other acquisitions. Mahrez is proven quality so unfortunately City have done well. I think one or two of Brighton's gambles will pay off too and that they will stay up, suspect they have done good business. Gibson is a good buy for Burnley, Deulefeu good value for Watford though they have not done enough, similarly Schar for Newcastle. Pereira, Maddison and Evans good for Leicester but they lost Mahrez and spent way too much on Danny Ward wtf... all very mixed. Cardiff have done well considering, I think Reid and Arter are good acquisitions.
Overall, Liverpool, City and maybe Fulham have had the best windows I reckon. Worst would be Huddersfield, Southampton and Watford who all looked in trouble at the start of the window and still do.