Before I bought my Rotex I did some extensive research into all kinds of eccentric sanders available and read quite a bit about this sander. Overal consensus was that it's a pretty decent sander that will get the job done and that it's a buy you won't soon regret. Nevertheless, lots of people insisted the comparable Metabo SXE 450 Turbo Tec was better. More durable and with the advantage that is has a fine mode with an eccentricity of 3 mm and an aggressive mode with a 6 mm swing. But I'm not speaking from experience, only reporting what I've read.
If money is a concern, why not try to find a used Rotex, I bought mine almost unused for only 275 euro. That makes very little difference with the price of a new Bosch or Metabo. I don't know how the market is in Scotland, but if you were in Holland, I would have found you a Rotex 150 in excellent condition for 250-300 euro in less than a week.