Penquin powerhead 1140

Anybody purchased this powerhead recently ?

I got mine about 2 years ago and about 1 year ago
it went down : the impeller covered with blue,
plastic shell caught a leak and rusted from inside.
The rust bulged out the plastic shell and the
impeller stopped moving at all...
About a month ago I found this pump tossed away
into the "junk-drawer" and found a use for it,
I got new impeller, put it in and after 4 weeks
of working I noticed it stopped again...
Inspected from inside and THE SAME THING: again
it was bulged out and the bottom of the impeller
was rusted...

I have other powerhead from the same manufacturer
but the smaller model (550). This one has ceramic
(?) impeller magnet without the plastic shell...
I am using this one over 2 years with no problems.

I would not recommend 1140 pump for any marine tank.
First: it is not reliable and quickly stop working.
Second: it leaks iron ions to the water in an
uncontrolled way poisoning the water. This pump is gone!

I wonder if this plastic shell over the impeller is
still used in new design... Anybody purchased it recently ?