I'm interested to know, especially from first hand experience if available, in terms of mobility of the arms and legs, which armor "type" (I'm sorry I'm not a historian or history buff so I'm not aware of the proper terms.) would limit range of motion less; so called "scale mail" which I'm told wasn't real but I digress, or a more plate or lorica segmantata type?
For the curious, my reason for being curious about this is pretty dumb I'm aware, but I basically want to make some protection that would require me to wear it around for a long time and run with it quite a bit as well as move my arms relatively unhindered. I'm throwing around ideas of either using cardboard for cheap and easily replaceable, or maybe even fabric sewn in to segments of some sort, I'm aware that a gambeson or "padded armor" would basically achieve this if I went with the latter.
Since your question is asking about first hand experience, and I'm not at my desk I'll try to answer without sources and hope it sticks.
The issue of mobility is a function of the inherent flexibility of the material and construction methods. For example, soft leather is on the more flexible end of the spectrum while steel is rather inflexible as a material. As for construction methods, articulating armors at and around joints is the ideal but sometimes easier said than done.
For armor to be effective it desires a certain level of hardness in order to turn away an attack, ie. a sword. Thus you end up sacrificing some mobility even in the best of circumstances. Even the best fitted steel harnesses of late period German and Italian masters limit full range of mobility somewhat. In general armors that are more flexible and provide more mobility are those that either do not hinder a joint or movement and only cover static surfaces of the body, or are intricately articulated.
So it's not so much a specific armor (maille, gambeson, leather, plate, etc) that is more or less flexible than the other but how they are put together. If you look at a global average of armor usage across materials and styles you might come away with items such as maille/lamellar, softer leather and gambeson, and well-articulated plate as being relatively flexible and mobile.