nd filters

First time using Sandmarc aerial ND filters on the Gopro and they are definitely a must for your arsenal. Definitely helped out in my shots not being overexposed which in turn allowed for better color and more details being captured. Best part is they are a lot more affordable than some other...

Which filters does everyone recommend, that they actually own, use and love? I'm looking for the cheapest, decent quality filter. I feel like I've already dropped a down payment on a house on this new little hobby....