In reply to Removed Useradmltk:
Mesh lined jackets are not threelayer, they are twolayer with a mesh protector for the membrane/to make sure your sweaty skin isn't directly against the membrane/coating
IMHO, if you go the second-hand route, know EXACTLY what you are looking for and know how to spot potential faults in the jacket. This is very hard to do online and pretty much impossible when you cannot check it out in person.
Therefore, there are a few things to keep in mind:
1) Age. Old waterproofs, even very well cared for and of very reputable brands, are prone to delamination and broken membranes. Waterproofs are complicated, anything over ten years of age I haven't properly tested I would not trust to still be fully waterproof. If you buy something this old for cheap, shower test it! Also, it might be hard to judge how well-cared for it is and old unwashed waterproofs can look good but as soon as you wash them they can delaminate quickly...
2) State. Any taping loose? Any delamination? This might be very hard to judge from a few pictures on the web but it is of the utmost importance with waterproofs.
3) Material. High quality membranes such as Gore-Tex Pro, Neoshell, Eco-Shell 3L, eVent or Dermizax 3L are better able to cope with heavy use than lighter weight. Under no circumstances would I personally buy an old (5+ years) 2 or 2,5L jacket. They are simply too fragile for it.
4) Brand. Good second hand deals exist, but you need to be able to trust that the brand builds for durability and makes use of good materials and construction.
5) Seller. Is this seller somebody who has good reviews and regularly sells outdoor gear? Then go for it. If this is somebody who never sells stuff like this and all of a sudden has a good deal? Meh.
All in all, you might be better off to buy second-hand on an outdoor forum or to save up and buy new for your first waterproof.