Novak has GREAT customer service. And how do I know, because EVERY SINGLE SPEEDO I've purchased from them has had to go back at least once.
I buy LRP, currently have 2 Quantum 2's. I went through 3 GTB's before getting a LRP Sphere. The Sphere was great, it just needed the Spektrum power cap because the BEC is weak. That's the BIGGEST flaw with LRP speedos is the 5.5v BEC. I believe the Q3 has a full 6v bec.
GM is another favorite. I don't think anything is as small as the SX12. Just don't try to program the thing, it's impossible.
Owned a Keyence Rapida Pro as well...nice speedo. larger than the Q2 but the programming was very nice.
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