Ahh, know that I see the actual unit at HF, that is not bad for the price & 25% discount - I thought it was some dual/function machine hence my original answer above. That actual mini-mill was the same mini-mill I started with. If you make small cuts and take your time, it will work well. I had it for about a year or two before I moved to a larger machine since I was tired of only being able to make small, shallow cuts, and the "small" table limited me to a smaller vice that was not as good/stiff as the Kurt I have now.
For the HF unit, you can look at the upgrades on this one (basically the same machine) to see what can be improved if/when needed:
SIEG X2D Mili Mill
The LittleMachineShop sells a high-torque version from the SIEG that might be worth considering in this size class:
HiTorque Mini Mill
The PM-727m is definitely a much heavier and rigid machine, DRO, etc., but much, much more expensive, so not a fair comparison. My machinist mentor always says to buy the heaviest machine you can afford, as they also tend to be more rigid, allow for a larger piece to be milled, etc..
Will