William.....
The changing of configurations is subjective, while one may use it as the reason to buy one, another person doesn't care about it. I personally don't care about the configuration aspect but may as time passes.
Now for some, switching out parts will be a huge factor and I can see the attraction but with owning other Sigs, If I feel the need for change I'll just grab one of them.
My opinion was strictly from the viewpoint of judging it as an every day carry piece. Whatever else it's capable of is icing on the cake. I had a Sig Pro 2340 when they came out and seeing as that was also a polymer based pistol, I can say without a doubt that the 250 is leagues better in balance, comfort in hand and even accuracy. Dependability isn't a factor because it seems whatever Sig one has, it can be run into the ground and still serve you well

Another point I have to bring up...I didn't pull out my Sig 226 to compare but the 250 seems to recover from recoil faster/easier(I shot .40 s&w). It's something I can't explain but it just feels more natural to hold and shoot. Maybe I'm confusing it with just being different and enjoyed it but when I buy it and directly compare with my carry 226.. if I get that same feeling again, my trusty 226 will reside in the safe while the 250 gets holstered strong side

**Oh and allow me to add the very simple & fast breakdown of the entire pistol, down to every spring mind you. There's a video on youtube and I was amazed at how simple it is to break down and thoroughly clean.
-Aaron-