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The Hitechs are thinner and don't come with a nice pouch.
nice=uselss, at least IMO. the provided pouch occupies too much space, weighs too much, and is a PITA to use. I personally keep my 100mm filers in these
Dramatically overpriced for what it is, but then everything Lee is ($70 for a threaded aluminum ring, anyone?)
I also had more color cast with them than I've had with my Lee filters.
Probably true, just by looking at the filters with naked eye you can see some brownish overtones in the Hitechs. Having said this, ALL ND filters produce a cast, but that is correctable in PP so unless it is dramatic I would not worry about it. Perhaps the only exception is srong (8-10x) NDs, where IR leakage can be a real killer.
I believe the larger ones are 4x5 instead of 4x6, but I could be wrong about that.
Overall, I think the Hitech filters provide a decent value for those of us that use them casually.