My only Festool sander right now is an RO 150, and I actually like the size and weight, though others obviously think differently: I'd suggest you find a local dealer that has them out on display and get some of these in your hands to see what they feel like. In random-orbit mode, the RO 150 is roughly equivalent to an ETS 150/5 in terms of its function (not in terms of ergonomics); the 150/3 with its shorter stroke width can theoretically achieve a finer finish quality, but will take a bit longer to get there.
Only thing I think is really "missing" with the RO 150 is a way to get into corners. Personally, I'm leaning toward the LS 130 to cover that and give myself even more flexibility in other ways, but again, that's me... some will prefer a delta pad like the one on the RO 90 or a DTS...
In a pinch right now, if I needed a delta function / corner sander, I have one on my Dremel MultiMax. No dust collection, so no good if I were using it regularly, but in a pinch...
And as others have pointed out, you might not really need that capability often, if at all.
The main differences between the RO 90 and the RO 150 would be the lack of a delta pad in the 150 and the shorter stroke width of the 90; beyond that, the 90 has a smaller pad so it can get into tighter spaces, but the 150 can cover a larger flat surface in a LOT less time and will allow you to work much more quickly.
Only thing I think is really "missing" with the RO 150 is a way to get into corners. Personally, I'm leaning toward the LS 130 to cover that and give myself even more flexibility in other ways, but again, that's me... some will prefer a delta pad like the one on the RO 90 or a DTS...
In a pinch right now, if I needed a delta function / corner sander, I have one on my Dremel MultiMax. No dust collection, so no good if I were using it regularly, but in a pinch...
And as others have pointed out, you might not really need that capability often, if at all.
The main differences between the RO 90 and the RO 150 would be the lack of a delta pad in the 150 and the shorter stroke width of the 90; beyond that, the 90 has a smaller pad so it can get into tighter spaces, but the 150 can cover a larger flat surface in a LOT less time and will allow you to work much more quickly.
