Former mac user, now Dell XPS user - my first impressions were great, second not so much. XPS laptops have a horrendous coil whine and a lot of model lines have an issue where the computer won't go to sleep(instead stays on with the fan off, resulting in the machine reaching burning temperatures if you just close the lid and put it in your bag). I've had the motherboard replaced 3 times now - both issues are still present. There's thread upon thread upon thread about both on Dell forums - and it seems Dell doesn't have an engineering solution, despite being on the 7th(?) generation of that laptop.