i have a dremel, well actually its my third one, but i work them hard at work !- the proxxon ' dremel type unit' unit is also very good but in my opinion not as good as the dremel...., i also have the proxxon circular saw and it is also excellent but for me the cost of dremel is the only bad point in my opinion,
they are good tools, you can work them hard (and i do), you can attatch the flexi shaft if you wish and the variable speed of the pro version is amazing, but the initial purchase cost is off putting,
i also have a very cheap version ( bought from cromwell tools- a national tool supplier) which is also mains is also classed as a 'pro' version and comes with flexi shaft, 120 tools/ cutters/ disks and sanding drums and all in a shiny aluminium case for a bit over £40...... its not quite a smooth as the dremel pro but for the money its excellent -at £40 you can throw it when the bearings/ motor sound rough away after a few years of hard use and replace it....
i believe in 'you get what you pay for' so buy the best you can afford, the dremel and the proxxon are both good units, plus the after sales at axminster power tools are first class......