The best AIO my team has found is the Tots Bots Easyfix fluffle, but AIO's are always an expensive option, as it means you have to have the same number of waterproofs as absorbent part, as they are of course all in one! Yo don't need nearly as many waterproofs if you have separate or pocket nappies, so that in itself makes them cheaper systems to use. The biggest problem with kushies, is that they use PVC not PUL for waterproofing, which means they go crunchy, do not breathe and are hot and uncomfortable. That's apart from the fact that they also use cotton flannelete as the absorbent bit. Sadly Kushies is one of the massive original shaped nappy companies, only interested in profit, has put all it's money into marketing, and has not updated their nappies as technical options and fabric range have increased. The best advice I can give is don't be put off if they don't work, because there are some excellent nappies out there!
As far as trials are concerned, I will always deal with trial enquiries within 24 hours, and usually well within 24 hours. You can trial whatever you wish of my stock. PM me if you want to go further with this. Trials can be sent out by post, so you don't need to be near me, and I will go through a personal advisory session with you online.