+ They are difficult, but not impossible to replace.

+ I'm aware of some junk skimmers, but no "heavy duty" ones.

+ What usually kills skimmers is EITHER improper construction technique OR freeze damage. Those problems would break a HD skimmer, too.

+ Stick to Hayward or Pentair products and you'll be OK . . . if you have good construction and don't let an ice cylinder form in a skimmer.