Aero WK face guard is horrible to use. I bought one a few years back and hated it. Took it off after 10 minutes and never touched it again. Visibility was poor and was uncomfortable. Bought a Masuri WK lid straight after and have used it for last 3 years. Great for keeping and batting.
I only have the original WK face guard and I kind of see why people don't like it (it isn't the most comfortable of headwear) but for me its still the best compromise. I suspect that were I more confident with my skills I might be happy taking a helmet on and off but the level I play at the pitches are either dead or mixed bounce so I'm invariably standing up or close. Hence I wear the mask all through the innings. Does anyone only wear their face guard for spin?