We have an Omnistor 2000 (as per Logburner) which re-winds into its box, permanently attached to the Eriba. We like it and do not find it difficult, although really it needs the 2 of us to operate it. I have previously had Fiamma CaravanStores and feel there is not much to choose between them and Omnistors. For me the main difference is that the CaravanStore bag can quite easily be removed (for whatever reason) whereas the Omnistor has to remain permanently in position.
I did post earlier about our CaravanStore being destroyed in a storm at Lake Garda. On that occasion the roof rafter flew out and penetrated the roof of our V70 (!). No roof rafter on an Omnistor as the roof supports are integral, so probably all-round the Omnistor-in-a-box is the more rugged item. However, your chances of being caught up in a Lake Garda scenario are probably remote. After that event, we always kept an eye open for windy conditions, and if in doubt took the CaravanStore down. We still do the same with the Omnistor. All said, they are all good for moderate conditions.....wind seems to be a problem for us all these days!