A Barlow lens changes the effective focal length of your telescope -- so 2x means it's 1500mm effective focal length and 3x means 2250mm effective focal length.
I personally recorded these observations, shown above I am imaging Jupiter on 2018-06-06, shown below.
Saturn 2017-08-08 - stacked, 2x Barlow
Jupiter 2018-04-15 - 3 image, 15 minute time lapse showing it rotating, 3x Barlow
Jupiter 2018-06-06 - Red Spot, 3x Barlow
The differences in the color of Jupiter is just the white balance settings -- I didn't really do any image editing or cleanup beyond stacking the images and I bumped up the brightness on Io so you can see it, otherwise it is too dark in my capture.
Here is a video of the moon I recorded using my iPhone (which isn't the greatest optical quality).
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