I bought 171v from [local store] for [$$$] with a discount. Installation and setup were incredibly easy. I found Natural Color SW useless. A week later I changed the block to another 171v as there was a noticeable color/contrast gradient from top to bottom. The new block had the same color/contrast gradient from top to bottom, albeit less pronounced. I'm not sure if I'll keep it or get a refund and buy an LCD monitor with digital input.
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