The Sub2000 is a very specialised gun, for certain specific useage - it doesn't fit everybody.
I personally consider it an absolute abomination - but that is just my experience based on handling and shooting my buddy's gun. If you are a taller person - it is far too short for comfort! Even my buddy, short little guy that he is, admits it's too short for him.
Putting a scope or optical sight on takes away it's one interesting feature - the folding.
The iron sights are horrid - plastic and easily damaged when trying to adjust!
On the other hand, it is reliable and shoots any ammo we put through it.
He has a .40 High-Point carbine now that he likes better.
As always, "your mileage may vary!"