I've used them for years as utility pumps to mix saltwater and RO. Never had one fail or leak juice, however; I won't put one on my main system because of the negative feedback from other users. Plus, Maxi-Jets are cheap if you buy them online.
The larger one were the ones that were the most prone to fail. I had numerous ones fail, some due the meltdown thing. Particularly bad were the 2500's, the 2100's, and the 1700's.
Eheim submersibles are quite nice IMO/IME, but they are pretty pricy.
There's also a new maxi jet line of utility pumps that look promising, but I wouldn't rely on a new pump until someone else had run one for a while
http://www.marinedepot.com/ps_Aquar...rium_systems_maxi-jet_mini-jet_micro-jet.html
I've had 2500s on my tanks for 8 years or so.....no preal problems.......YET.....
if you're planning on a submersible pump, look at oceanrunner pumps....quiet, efficient, and they rock