A pensioner friend was looking for her 1st. ebike, with a small budget. She saw this: https://www.facebook.com/marketplace/item/957263585722510/?ref=search&referral_code=null&referral_story_type=post&tracking=browse_serp:5dd7308a-43db-4a21-acf4-10e3ae0aa30b.............I see it has only 3 gears. What would be the downside of this? Quite hilly down here.......