Most of the people who I know who got one said the biggest problem was getting the cartridges to feed correctly from the mag. I will say that none of these individuals shot a lot though, so I can't speak for barrel wear.
This problem is easily solved by installing a center feed mag box. All short mag have this problem if they are in a staggered magazine. The center feed mags are also the best in the big magnums because of there diameter and the fact that the bullet never touches anything during charging.
The barrel life/erosion has more to do with shooting habits and loading than the cartridge it's self.
If you shoot to fast in any cartridge (Not allowing some cool down time) you can wash the barrel out prematurely. if you load a slow burning powder that does not completely burn in the barrel, you get barrel erosion and throat erosion early on.
If you shoot a dirty barrel (Carbon and copper fouled) this also speeds up the process.
Twist rates and barrel material can also have a bearing on barrel life.
Another thing that can decrease barrel life is excessive velocities.
I have owned and shot most of the short mags and found no real difference in the barrel life compared to other cartridges pushed to there velocities.
The short mag design was designed to improve the powder burn inside the case minimizing the amount of un-burnt powder from entering the throat, and if the proper load is shot at the same velocity and with the same weight bullet, in theory barrel erosion should be less in the short mag, Not more.
The 223 WSSM can be loaded to exceed most other .223's. but if maintained properly and fed good well though out ammo barrel erosion should not be an issue. In fact an improper load in a .308 can
wash out a barrel faster.
The .223 WSSM is a great and fun cartridge and is properly loaded, fired and cleaned it should last a long time.
Just my opinion
J E CUSTOM