I have both the the R1 and the RX1 models . The RX1 is clearly a better performer with a superior build (it’s larger and heftier ) ....but at a lot more money. In any case, they all share a common feature - they are designed to be placed up close against a wall even though they are rear-ported. In fact they have OEM REGA wall brackets as options.
here’s a review that summarizes it well:
The Rega R1 Loudspeaker - A New Budget Reference
“... Immediate impressions are a clear and transparent portrayal with very high detail retrieval, fast and controlled transient response, and superb musical timing, both in articulating rhythms and tempi, and in placing instruments within the temporal flow and context of the performance. The RR125 is an outstanding mid/bass driver, sonically and musically right in line with the midrange performance of Rega’s amplifiers and phono cartridges. Get the midrange right and everything else will fall into place. Get it wrong, and all the king’s horses…
...The Rega R1 becomes my new budget reference speaker. In addition of its ability to get the fundamentals of music right, it adds clarity and resolution, and an ability to lay out a vivid and coherent 3-dimensional stereo image. In small room applications, what more could you want?...”