Is it possible to swop the bases on these sanders as the 400 has a section in the box for the delta base. I have both but the delta would also be handy to have but its not cost efficient to buy all three.
With regard to warranty .... there's very little that can go wrong with the DTS/RTS. If you know how to use a screwdriver you should never have to worry about maintenance or repairs. Besides that, it's built like a tank.