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I haven't used the HD38's, but the trail xp series has a much better image than the FLIR LS both 640x480 (even though they should be similar).

What are you looking at using it for?

I've used both pulsar (Helion and Trail) and FLIR LS units a fair bit. The FLIR units are more compact and seem more robust (but have yet to break a pulsar or a FLIR for that matter), but the image...