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Phil, take a look at the two images at the bottom of this thread.
You have to be careful with a laser, but, yeah it’s worth it.
If you are going to do images I would get the 2.8 watt, if you are just going to do engraving and cutting I would get the 3.8 watt. The 2.8 has less power and will be a bit slower, but it has a smaller dot size which, in my opinion, would give you better images.