The included "lemon oil" is in fact a petrochemical mineral oil, which seems to be rather common among these products. While suitably low on acidic content, it also doesn't penetrate wood and I really wonder if it has any effect at all apart from building up residue on your fretboard. Saliva or simply fatty oils from your hands would be a much better option for rosewood.
The cleaning components are fine, suitably low on solvents other than naphta.
I would _not_ use this kit for everyday instrument care, only for guitars in bad condition that need a deep cleaning.