I have lift blocks and use them on my standard jack stands without concern, even when applying 148 ft*lbs via torque wrench to the front caliper bolts. The only downside is that your lift blocks will get marked up.
Even if I didn't use the lift blocks with jackstands I highly recommend installing lift pads to make it less likely that a tire/service shop lifts the car incorrectly (very common) and bends your front quarter panels.
I agree that painted metal (jackstand) on anodized metal (lift block) is not a great interface but I felt that adding rubber pads to the tops of my jack stands actually made it more unstable. Just make sure to carefully center the lift pad on the jack stand. The perfect solution is the ESCO jack stands with the lift blocks, I'll pick up those jack stands at some point in the future.
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