Tricks of the trade.

First to address the bead, your plasterer may have done a too thin layer hence you could see the bead. A thin layer of plaster on top of that could potentially cover that bead. If you could upload pictures I may be able to suggest another option. Second with the cutting in, that is dependent on how the paint is mixed. Some brands of paint do not have the components properly homogenised and naturally rolling and brushing will give you a different effect. The cutting in can be done first with a brush then with a small roller immediately to blend in the brush marks. A word of warning, when going near your ceiling take your time with the roller, darker colours are harder to hide with white paint. I normally use either Dulux Trade or Leyland Trade paints, they are thicker and cover better. I have never had a problem with my cutting in being visible. I did however have a client who supplied the paints and it was Dulux but was mixed in a shop (not sure which one, but was not a specialised paint centre). I had the same problem and i had to cut in with a brush and roller to hide the marks. With regards to tools. I use only Harris and Purdy brushes and rollers, they are a bit more expensive but I have never had problems with them. For future, I would advise you to only state the colour you want and let the painter supply the materials. Pretty much every tradesman has colour guides of the major brands rolling around in his tool box. This way they always buy supplies from the same shops and will know what to expect. I hope this helps, good luck!

I've come across this issue before and it can be a pain, a quick trick I learnt especially as I'm no good with plaster is to get some Filler and skim that down the bead. When dry sand it down to remove edges and leave just enough to hide the bead. The same ad with plaster but I find it easier. Depending how good you are with sand paper you won't see a thing. This really is an easy quick fix if your looking to save money. Hope it helps.