Friction Drive - kits from Aliexpress. Any Good? Has anyone Tried them?

Hi, there seems to be 3 varieties worth looking at. Most of them come in price ~200 - 400 eur, depending on shipping cost / customs tax, which might be added on top of order.

This one seems to be most promising, also boasts 36v and 500W of power:

https://www.aliexpress.com/i/32965870432.html

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There's also one with narrow roller/wheel:

https://www.aliexpress.com/store/product/Booster-200W-With-Battery-Modified-Moped-Kit-Bicycle-Friction-Drive-DIY-Electric-Bike-Brushless-Motor-Better/1846412_32950880657.html?fbclid=IwAR26yqLXn7tU8-0JNM8vxvw6lPxmed0vw9qxMYMh5nnhSA9aXmhcJA6hEAI&af=137322&aff_platform=aaf&cpt=1553460716277&afref=&subid1=DPlnKr2ATnM&dp=02d383c210e7fea98d8e11b087a76b59&onelink_item_from=32950880657&onelink_thrd=0.0&onelink_page_from=ITEM_DETAIL&cv=47843&onelink_item_to=32950880657&pvid=c2232730-7c8a-40d9-9bbc-8ebd8af28691&mall_affr=pr3&onelink_duration=0.986617&sk=VnYZvQVf&aff_trace_key=d5e0b69d6d98426abf5c18a1bce758d4-1553460716277-03558-VnYZvQVf&onelink_status=noneresult&scm=1007.22893.125764.0&terminal_id=026a587e77e5478b910b36ab53e6fdf2&onelink_page_to=ITEM_DETAIL

This one also seems to be worth testing, also cheaper than the first option

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And one with pulley system:

https://www.aliexpress.com/item/200W-Booster-With-Battery-Modified-Moped-Kit-Bicycle-Friction-Drive-DIY-Electric-Bike-200W-Brushless-High/32945061140.html

This one gives me the least trust to buy it / try it
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Any feedback would be great.. some anonymous aliexpress buyers have left a few notes but it is not enough to determine its

Sorry, I don't know anything about quality, but I can confirm that today's prices are almost minimal.
For the first item https://www.aliexpress.com/i/32965870432.html see this page https://www. pricearchive.org/aliexpress.com/item/32965870432. The price has risen by 4 dollars, but perhaps during the sale it will fall. Sale will be in a few days.

For the second item https://www.aliexpress.com/store/pr...ushless-Motor-Better/1846412_32950880657.html The price has risen by 2 dollars but earlier the price rose in price more - https://www. pricearchive.org/aliexpress.com/item/32950880657. Be sure to look at what price is best to buy.

And finally for the third item https://www.aliexpress.com/item/200...ric-Bike-200W-Brushless-High/32945061140.html see the price history graph here - https://www. pricearchive.org/aliexpress.com/item/32945061140

I hope this helps you.

Hi, didnt see your reply earlier.. Emm what u mean with price differences? Does it mean they havent been selling well?

I just decided to complete your post and write pricing information. Pricing information is always helpful to know, agree?

Ah, i get your point now.

Well the cheapest kit is around 200usd / eur while most expensive is around 350-400usd / 350 eur