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I think the manifold is not such a big deal. A good plumber should be able to handle that. The Radiantec contractor should be better at putting it all together compared to DiY + hiring tradespeople (plumbers, etc.). No learning curve to pay for. On the other hand, they might not be cheaper since you'll pay for everything. The clips vs. AL plates is not not clear to me. How do they "balance the heat?" AL plates will conduct the heat into your basement, even though they tightly hold the piping up to your subfloor. The connectors are probably OK, but I'd watch for them loosening up over time with many heat cycles. I have not idea if they are any better than other vendors.
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Jim R.
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