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I have the TV 3x barlow and its an excellent unit. It's not that expensive and given how important the barlow is in your imaging train I wouldn't go for a cheaper unit. BTW if you own the TV 2x barlow and the TV 3x barlow you can mix and match them to make a 2.5x barlow, not that I've tried it but its been discussed on CN.
My main imaging scope is a 10" with a FL of 3m and I only occasionally get good enough seeing to use the 3x barlow for lunar imaging, usually I am using the 1.8x TMB ED barlow or the 2.5x powermate.
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