I am looking at a mill and trying to decide between two different ones, and was hoping members could shed some light on them.
Unfortunately my light is pretty dim when it comes to the machines you selected. I wouldn't buy any of them.
The first is the x2 from harbor freight and with coupon can be had for bout 500$
If you want an X2 sized mill go to Little Machine Shop or another vendor selling solid column variants. The column mount is perhaps the biggest weak link in the machine the original X 2 design.
I like this for price and the many options available for upgrade, ( cnc , dro, etc) and also having dovetail column. Figure price with cnc will b 1000$ which makes the other mill the alternate.
If your intentions are CNC related you really need to think much harder about what will be the best machine for you. In my opinion the original X2 isn't suitable for CNC conversion if you are about to buy all new for that conversion.
As to upgrades, any machine can be upgraded. That shouldn't even come into the equation.
But am. Pretty worried about y movement being 4 inches, that sounds too small. Am sure to run into something that is bigger than a model so... How big is some stuff that can be done on this mill?
Well that depends upon your interests. For me it is too small of a stroke. The common mistake people make is buying too small so if you are worried now that is a bad sign. In the end you need to nail down what your interests are because that dictates what the proper machine is.
The other is the round column heavy duty mill with 9 inch y movement, which sounds pretty nice for bench machine.
If your interests involve CNC it is useless.
This also is able to upgrade to cnc, but doesn't seem as popular. Heard complaints about z axis.
It isn't a question of hearing it is rather understanding. That is you need to understand the limitations and incredible difficulties a round column mill gives you when it comes to CNCing the machine. If you understand that you wouldn't even be considering a round column mill. Having used such mills for manual work I can also say they leave a lot to be desired for manual use.
This one is only 400$ more amd more than. Doubles everything from righty to workable dimensions. Or so it seems. Are their problems that I am unaware of that I should stay away from this unit other other?
You are actually lucky in one sense, there is more hardware to choose from than at anytime in the past. As such I'd limit searching to machines with either dovetailed columns or columns with linear slides. Linear slides will put the machine out of the more reasonable price range though. So in a nut shell stay away from both units. If an X 2 sized mill is right for you go the "solid" column route.
However your concerns about travels on an X2 are real so look for a slightly bigger machine. Yes that puts you into another price category, but if you are already concerned about travels it would be foolish to invest in a machine that is too small.