Foil Drive 8a fast battery charger

Does anyone have any experience with how must faster the 8a fast battery charger is over of the standard charger?
trying to decide on investing in the fast charger($280 USD) vs another battery ($1k USD).
thank you

Get the battery and another 4ah charger, that way you can charge both batteries at the same time. Your batteries will last longer as they aren’t being charged at a high rate (less heat generated). You will have perfect 2 battery sessions with a quick battery change midway.

i got the extra battery, then after a few weeks I realized it’s not practical to use 1 slow charger for 2 batteries so I got the fast one. I charge mostly with the slow one but when there’s a surprise session coming or day after day with only few hours at home while awake, i use the fast one

Thank you, This is very helpful. Just ordered the fast charger.