We put the OME 2." HD rate springs out my 2007 JK with 50,000+ hard miles on them in a 2012 and they still provided 3" of lift and ride great.
No worries on buying them, used. Very well built springs, they don't sag.
You will need the additional parts that come with the OME lift for proper fitment.
Brake line extensions, longer shocks, rear track bar relocation bracket and 2" bump stop extensions.