I had to noclip twice on Second Wind, once to get through the water gate to raise the second lever and again with the wall behind the bookcase. This can be forgiven almost considering how fucking gorgeous the episode looks (the cutscene at the beginning was really impressive).
So far, these are my thoughts on the mod:
Labcoats Required - Crap, just another boring HL episode, the level design is pretty dire to boot.
It's Safer Here - Again, crap. This had the potential to be great, mixing in the City 17 location with the Xen aliens and the like and instead it's filled with Half-Life textures, crappy edited grunt models and horrible texture rips from HL2 (that 'gate' texture made me want to vomit). You can't do City 17 on goldsource and have it look as good as it would in HL2, but with some work you can still get it to look really nice.
Coil - Excellent episode here, brilliant level design in both visuals and construction, loved it.
Cyan - This one is probably my favourite so far, great design and puzzle setup, I liked the instant battery recharge units and the use of the PS2 stations.
Echo Transit - This one was a breath of fresh air too, great design, the idea of having to protect the crane was well thought out and the new dialogue works really well. Only complaint is that the time you need to take out the APC and defuse those bombs is too short to actually be properly doable, I confess I had to cheat to beat this section.
Emcamped - This was ok, nothing that special, it was nice how they had the alien soldiers being controlled by the slaves.