I went for the SX1L from Arc too. Excellent service before and after. The large 400mm table and increase 140mm cross travel sold it to me. (that and a really good accessories package!!!)
Out of the box after a good strip clean and setup the machine was ok, I wouldn't say anything more than that. I bought in a rigid column from an older model of the X1 (maybe the same as your CMD10?) from the LittleMachineShop in the states and ditched the almost useless tilting column in favour of a tilting vice.
It transformed the machine. I then needed MORE POWER – lots more it seemed, as the machine was suddenly strong enough to make full use of the small DC motor and this led me to move it on not to long after upgrading the column as it was more work than it was worth upgrading the motor and converting to belt drive.
About a year after I bought it, and before I sold it on, a new X1 version came to Arc, with a rigid column, and a motor with double the power and direct belt drive – it's basically every mod you'd want to do to an X1 rolled in to a nice package. I ended up with a much bigger machine in the end, but the 400mm table on the X1 already outclasses most small machines. I think they also do a similar but wider rigid column X2 with the X1 table (as its larger than the stock X2).
If I had to do it all again, I would go with this new X1 version, and then no doubt think to myself, I should have stretched to the even more rigid powerful 500w X2 as I still think the improved 250w X1 might srtuggle but will be a marked improvement for sure.