alpha racing camshafts 4.1.1

hello
does anyone have any experience in alpha racing cam shafts stage 4.1.1 ?
last month i purchased a set for my 2011 , but i heard horror stories about them , that they brake engines ! because of the lope duration being not correct .
i bought the heavy duty springs and retainers from another company because alpha is very expensive but they should work fine.but until now i am scared to install them. appreciate any help thank you .

Remove all molly grease from camshafts (use a de-greaser), Use the good tools, be precise when removing/installing valves, use good quality correct spec springs, all torque settings and sequence of removal/installation are followed, make sure the valve clearances are correct when installed. Worth checking ignition timing and fuelling afterwards.

https://youtu.be/Lc6jyChNonk

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all that work for very little gain