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I have a 5mm TMB/Burgess (or one of these "look-alikes"?) which I use in my 305mm f5 dobsonian. So 300x. Most nights that I look through it at planets or Moon, I pack it away again. Very occasionally I look and Wow! I've even been able to barlow x2 sometimes. If you can afford to have one in your eyepiece case for those rare wonderful seeing conditions, it is worth it. Yes, without tracking you need quality mechanicals on your scope and a very soft touch with your "tracking" hand.
ps. don't buy a 6mm plossl - eye relief is very short.
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