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In using an ND to soften water feature photography, most photographers want to get as close to the foreground of the scene as possible - i.e. wide-angle - that rules out the ring type adjustables, no matter how convenient they may seem to be.
The Lee Big Stopper (10 stop) is fabricated using a 1/16" annealed glass plate with a 1/16" gasket - it wants breaks & it breaks very easily. I had read of many reports of the BS's breaking & in knowing their fragility, I had one inside of a 4x6 filter pack, individually sandwiched between two hard padded dividers, that was between 2 other resin GND 4x6's plus hard padded dividers on each side, in the top pocket of a common backpack - & no I didn't drop (etc.) the pack. It seems for $200+ dollars you should be able to get the filter to the destination.
The "blue-ish" color cast is more like it washes color out. The gray and black tones go to dark gray & black/black - you can move that around in post but you can't get color back that isn't there in the first place. Also, 10 stops is a lot of ND - plan on 15-30-60+ seconds exposures - except in bright light conditions, which doesn't lend itself to water feature photography. I wouldn't want a 10 stop as my primary ND - much too limiting.
Formatt / HiTech have a "Pro-stop" line of 4x4 ND's - resin with a gasket. I found the 6 stop to be the best as far as keeping true color - and can also use it in coordination with an additional GND, also using the Lee holder on top of a CPL mounted to the lens, and ISO 50 for another reduced stop. Though I don't like stacking filters, I've found that method renders a higher IQ than the darker ND's. Then of course remember to cover your OVF when doing long exposures.