All of the Teleview Ranger accessories can be used on the Brandon with no adapters. Its the wave of the future. Bet on it. With the Brandon there is no need to sell your eyepieces and accessories if you get a new scope. You can use the scope with glasses on.
Many people have astigmatisms that are only corrected with prescription glasses.
A rubber eyecup is coming in December and can be retrofitted for the scopes already sold. You can add filters to improve the image. Polarizing for glare and fog, amber for low light and numerous filters for photography. All are standard sizes, all available at you local camera shop. No special attachments.