when it comes to watches:
1) if they dont tell you where they are made.....they are made in china.
2) if they dont specify the movement....its the cheapest movement.
it looks like they are all sporting saphire crystals, which should be expected, especially for $500+ watches.
looks like either Seiko or Ronda movements....which are fine....solid workhorses, and to be expected for this price range.
almost certainly made in China...which...eh...the movement is the important part, so China made, for the price really doesnt mean poor quality....just doesnt have the panache of "Swiss/ German/ Japanese/ American made"
water resistance of 50-200M depending on model...which is fine.
they are a little garish for my taste....ide expect something a little more utilitarian...especially if its sporting the "glock" logo.....i was expecting to see a more a Marathon vibe.
personally i also think they are $100-150 over priced....but thats likely due to there being no grey-market dealers for them.
if you like them, it probably wont be a bad watch for you.