Losi brushless motors - any good?

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Hi all,

I'm looking at getting either a 7.5 or 8.5 for my B4 and was wondering how the Losi motors compare to Speed Passion, LRP, etc. They are quite a bit cheaper than most other 'race' brands and was wondering if there is a reason why? Or in other words, why should I buy Speed Passion, LRP, etc instead of a Losi motor?

Thanks.