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El. Puerh, You should go ahead with your project. I'm using a QS 138 mid drive on my project. I haven't try others but I shopped alot before buying. I have nothing bad to say about quality, but their aftersales service is non existant. You should buy from a retailer who can provide good assistance. QS also offer many controllers, some are better then others.

The Votol is not fully mappable.

Where are you located?
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