I like this pool but there are worker and stability issues
Scrypt us west just went down and worker hashrates are very inconsistent
There are no stability issues -- stratum gets restarted from time to time when we add new coins -- use failovers, and use the 02 stratums when possible as they are less crowded.
Can you be so kind to answer my questions. Thanks

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Reject % is a direct relation to what coins we mine -- sometimes we're mining low diff X11 coins, sometimes we're not.. your rejects should fluctuate accordingly.. that being said I've been mining steady on x11 for over 24hrs with 0.9% rejects.
Make sure you're using a stratum closest to you and use one of the 02 stratum's if one is in your region.