The service from free range kids was excellent, next day delivery even though I ordered on a friday! The ergo carrier is very comfortable when used in the back position but is tricky to get on, I've had to rely on the kindness of strangers once or twice. I found the method described in the instructions fine for putting my daughter on my back when using the carrier in the house however once we both had coats on I found it impossible to get her into the pouch. I have developed a method of putting her into the pouch part of the carrier on my front then swivelling her round to the back having read reviews on the ergo website where people suggested doing this and am having much more success using the carrier now -coats and all. The hip position is also good for shorter periods of time. My daughter is 14 months and personally I don't think I would have wanted to use this carrier any earlier as for front carrying my wilkinet is much more comfortable and for people with younger smaller babies I would highly recommend that instead. I think the ergo carrier will get easier as she gets bigger and more able to co-operate in the process.
Overall I would recommend this carrier especially if you want it for back, just be prepared to persevere a bit!