SunRace quality vs Shimano Altus line?

Can anyone tell me if SunRace is a decent brand?  I've been running my front triple on a used Shimano Altus M311 (22/32/42) w/o a chain guard. Been bit at least 3 times now by the gear backing onto the trike. Used = sharp as a razor.

I just ordered a SunRace M600 22/32/42 WITH chain guard from Amazon and I'm hoping I didn't make a mistake.

The Altus is riveted, no changing anything about that. The SunRacer has standard bolts, allowing future changes.

Thoughts, inputs, suggestions? 
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