I've been using this filter for a while now and I'm liking it. No X pattern at all. Useful range of densities; in bright conditions I slap a constant ND8 on under it to bring the variable density adjustment down to a useful range. I imagine it has a slight color-cast to it, like most do, but so far my footage has been very easy to balance with no obvious weirdness; if anything it often doesn't seem to need much correction. The filter's pretty thin and not too intrusive in use. Only real downside is that it has a different end diameter from the lens, so the lens hood (and cap) can't be used at the same time - but that's pretty usual, I believe. Overall it's a good filter and sure beats trying to control exposure with multiple single-density ND filters, as I was before.
01/05/2019
I really do like this, made from good quality material and has a constant filter when varying the brightness of it. Would recommend.
30/10/2018