I bought these to protect my new rcf's whilst waiting for the official rcf bags to come into stock. I now have rcf bags and use these on my old mackie srm450's. I see these bags as 'better than nothing' but are no competition to the real padded rcf bags. For the price they are good value, but maybe more suited to an 'occasional user' rather than a frequent gigging musician.
They are more of a bargain dust cover than a bag to protect your speakers. If you spend 900£ on a pair of speakers then make it 1000£ and buy the rcf bags!