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Transport is definitely the issue with 12 solid tube. Wouldn't do it if you have a bad back. A trolley to assist with moving it outside is a must. Also if you are going to a dark site or away from home your car must be capable of fitting it. I have an Astra wagon and the tube goes in easily, its the mount that just sqeezes in. If I had a sedan or hatch, I would struggle.
The main thing with those advising against a 12" for beginners is the old adage "the best scope is the one you use the most" and if it becomes too much hassle to carry it outside, it won't get used. Another issue with 12" is that they do need regular collimation. Investing in knobs and collimation tools adds to the expense and there is a learning curve to get over.
That said, I am very happy with my 12" GSO dob.
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