Hi guys, just to help clear any confusion here.
The SXE 450 TurboTec is the new version of the SXE 450 Duo. They both have the famous and totally unique 'duo' oscillating circuit. The duo oscillating circuit changes the orbit action of the base pad. The old one was 6 mm and 3 mm. The new one is 6.3 mm and 2.8 mm.
The 6.3 mm gives a wider orbit pattern (6.3 mm away from centre) resulting in a more aggressive action which gives you a far greater material removal rate so this is a great setting for sanding down rough wood very quickly in conjunction with a 40, 60 or 80 grit paper.
The 2.8 mm setting is especially for fine finishing or polishing work. The more focussed 2.8 mm orbit produces less pull as the oscillation away from centre is far less than the 6.3 mm setting or the 5 mm settings you will usually find on orbital sanders from other brands. This means you get a finer finish quicker and with more control, especially important when applying dies or waxes to furniture or even the car on the weekend which I must add this machine is VERY good at, even better than a dedicated polisher in my opinion.
As with regard to the motor size, the new TurboTec uses a smaller motor which helps make the machine 500 g lighter than the older model. The new motor however is more efficient and with an improved gear design and the Turbo boost switch the new machine is actually 500 rpm quicker than the old. All in all pretty much the same and in all honesty I can not physically tell or feel the difference between old and new, they both perform brilliantly.
What you will notice however is that the new TurboTec machine is lighter, more compact and much more comfortable to use + it comes with a newer filtering system called Intec which captures dust very well. We would however always recommend connecting your sander up to a vacuum cleaner like the Metabo ASR 2025 for near 100% dust capture, especially important if working with hard woods.
For independent reviews check out the metabo.co.uk web site here:
http://www.metabo.co.uk/Product-Reviews ... 650.0.html
I hope this helps and all the best.