The pen and pencil are lightweight, but don't feel cheap. On the contrary I think they feel quite nice. The threading on the cap and tail section (for posting) is not very deep which may be my only real gripe as I feel that it could be possible to wear over time with use. When posting the cap you sometimes have to align it just right which, after several times threading it misaligned might cause some stripping issues. I can't really speak to it now, but just a thought.
The Eco-Essential pen comes in two varieties: the Pilot Hi-Tec-C version and the Pilot G2 version. I was sent the Hi-Tec-C version as a sample and although this refill is quite low on my totem pole of favorite refills (blasphemy!), I have enjoyed using it in this pen. It is much more comfortable than the sharp plastic edges of the standard barrel the Hi-Tec-C comes in...