While not as precise as dedicated dosing pumps, aqualifter is far more precise than any other pump, and precise enough for 2-part dosing based on my experience. Yes, it's cheap and it may not be as reliable as the true dosing pump, but it's far better than hand dosing.
I've been dosing using these pumps for about 10 months, and so far I haven't found issues with the pumps themselves. While I would also advise anyone considering dosing pumps to go out and get the true dosing pumps, these aqualifters do the job when coupled with controllers like RKL.
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