I have used LRP speedos since they first came out, and I love them dearly. Even today, I cannot beat the feel of an LRP speedo, their simplicity of set-up and their reliability. However...
If I had stuck with LRP for the last two years in BL, I would by now be on my fourth speedo - at an average of $250 each!! I did buy two (Sphere 2007 and Stock Spec) but seeing what Tekin were doing, I bought an RS for my spare car. I am so pleased with it that I have changed to the RS for my main car, and sold my Stock Spec.
Both the GM and AE BD do software updates, but they charge and you send the speedo back to them.
I would love to run LRP again, but I just can't afford it any more. For the average Joe, the Tekin is cheaper to buy in the first place, and gets software updates for free, too. For me, it's currently a no-brainer. HTH