My wife and I both in our 60's have just returned from a 2 week holiday abroad using our new Carlton Glider II cases, we found that:- They were nice and roomy when packing, although the cases only came with one pocket inside where our previous Carlton Airtek came with 2 pockets, so we used one each from our other case. The combination lock works fine, but the catch is not as easy to operate as our previous Airtek case. The end catches have keys and we found that these were a nuisance. I presume that the lock is there because of the case being less ridged and quite flexible. The reason for choosing a case with a combination lock was to be keyless, and if a lock is required I wonder how much extra a combination lock in these 2 positions would have added to the cost of the case. We used the locking mechanism which is quite crude, but found on each case the end with the wheels was very difficult to unlock and struggled for some time before we could open the case. At other times when pulling the cases there was a need to lift up steps and we both felt a lack of confidence in whether this pulling handle would take the weight of 20kg. So we used the side handle which was at times awkward. In all pulling the Glider II Hard PP 2 Wheeled trolly Case was much easier than pulling the old Airtek and one could rush without getting a speed wobble, but I think that it could be improved slightly as metioned above making it a much better product.