We aim to play Bananagrams every day, five or six days a week is what we've been doing.
I feel it will help my son who does not normally see letters in his head start to see them as moveable objects. My older son is a visual thinker who sees pictoral images of items. When I hear a word, I see it spelled out with floating letters, spelled correctly, since I'm one of those "natural spellers".
While playing the game a person is forced to constantly think of new ways to arrange letters to make new and different words in order to use up all the letter tiles in their possession. In creating the words the player must think of right ways to spell the letters and in our family we also help each other by clarifiying how to correctly spell the words as we play the game (instead of waiting until the end to reveal they made a mistake and getting penalized and having to rework the whole thing).
My son with dyslexia symptoms finds this a difficult exercise which is still at a frustration point. He has been improving, moving from mostly three and four letter words breaking through to make larger words. He has a long way to go but he is on the right track.
One of the biggest challenges for me is letting go of already formed words to scrap it completely in order to make new larger words. I tend to want to hold onto the already finished words but I'm then left with reject letters that just can't be easily added on to the existing words to use them up. That's a strategy for failure.
A homeschool mom friend has been playing Bananagrams every day with her family for about four months, and it has helped her visual spatial learner child learn to spell. We'll see how it goes for my struggling speller.
As you can see from the below grid, my son is indeed moving away from three and four letter words. But, I didn't have the heart to tell him there is a "u" in ratatouille....