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I have been using a 2.5x powermate but once my camera is fitted the f ratio is smaller than 25. You can either use the barlow and get a nice resolution of detail with good image scale but (in most locations) to achieve this, have to fish frequently for occasional and sometimes small periods of good seeing, or to meet more typical seeing you can use a smaller image scale without a barlow at f10, or even adding a reducer below f10 and go for a wider angle shot of a tiny sized planet and its moons. Catching the planet with its moons make a nice pic in itself.
Another option is to use the barlow all the time but reduce the size of the final processed image when seeing is poorer.
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