I have around 12,000 miles along with a full road racing season on a set of their 2x9 shifters, not sure of the exact model but they were the model released before the current R9. Circa 2012 I think. They work great; very positive action both in feel and volume, "clicky" as mentioned above. Downshifts are limited to 1 per button press but upshifts are 3 at a time per lever swing.

I also had a few hundred miles on the newer R9 2x9 model. These are significantly better than the old model. The clicks are easier but feel better and the upshift lever swing is slightly shorter while being more positive. Compared to Shimano Sora they work exactly the same, I've found the differences are mostly ergonomic and related to how they operate.

Microshift shifters shift the same as Shimano road so they should have the same compatibility crossover with respect to derailleurs.

The last 9 speed levers you linked are the older model. I'd look around for the R9 models as they are the new design and significantly better.
Full Warranty Microshift R9 Double 9 Speed Dual Control Levers | eBay