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I purchased the Orion "Combo" sighting / Cheshire tube a couple of months ago, and love it .... this IS the one you do want if you're buying only one of the 2 tools.
Don't get "just" a sighting tube, make sure it's got the Cheshire function (ie 45 degree side mirror) built in as well. My viewing improved IMMEDIATELY whcih meant my pleasure improived immediately as well - because I was able to set a much more precise collimation on my 10" reflector. I started to see very faint stars, fine detailson Jupiter, etc, that I simply had not been able to visually resolve previously.
Having said that I now also have the laser collimator - yes, very useful to fine tune the collimation quickly AFTER using the combo tube, but I'd rate the combo as being more useful.
Again if you decide to eventually get the laser tool as well don't get the "basic" version, make sure you get the version with the "return beam target". Once you use it, you'll understand clearly why.
Hope that all helps - from one collimation newbie to another!
Steve
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