I bought one (the LimeSDR) and based on that experience declined to buy the mini. If I had to summarize the mismatch it was that MyriadRF, the folks who are the actual developers behind the systems, had a decidedly windows/microwave focus. If you wanted to build an LTE simulator and use PothOS on Windows there were people to talk to, but gnuradio and Linux support was hit or miss. That was made particularly challenging by the LimeSDR folks modifying and building tools in their own PPAs which had incompatible changes/libraries with the 'mainline' sources. As a result I could build a working gnuradio setup that only had LimeSDR support (through SoapySDR) or one that supported the other three SDRs I had simultaneously. That was really painful.

The 'microwave' focus was particularly apparent when, by default, there was no reasonable way to listen in on things below about 200Mhz. (all the FM band for example). They later offered an HF mod which was to remove an inductor(coil) from the front end selector on one of the antenna inputs to give it better frequency response.

Even with the change I found a number of systems with better performance in the low bands. It isn't a deal killer but it means if you're going to be exploring the low bands you probably want an upconverter.