I enjoyed the RS1s for a couple of years. They share the same tweeter and mid frequency driver as the RS5. So while I can't specifically comment on the bass i can comment on the rest. The tweeter is really amazing, I guess mostly due to its zero reflection technology. They are lively, dynamic and realistic without being overly bright. The cymbals sound more articulate and dynamic than speakers up to 6 times their price i've audioned (harbeth, revel, psb) They have excellent synnergy with rega amplification that favors body and weight in the midrange. The midrange is quite good too: amazing dynamics and detail. Voices, however, can sound a bit artificial and 'papery'. This is minor criticism though as its a flaw easily ignored when facing a wide, clear and tidy soundstage.
When I decided to upgrade I lusted over the rs3 and 5s for a few weeks, but since I couldn't audition (I could only order them), I went for a different brand. Mostly due to the side firing woofer and fear of nasty room intearctions as my side walls are fairly close. I wasn't too convinced with the idea of having a bass driver shooting into my rig that's placed between the speakers either.
So, my advise is: 1. you need a warmish sounding amp for these guys to deliver a fully engaging performance. They will sound sterile with analytical amplification.
2. Make sure to have spare space to the sides or have your vibration sensitive front ends well away from the area between the speakers.
3. Audition in your space. Ask your dealer to borrow them for a weekend. Experiment with drivers firing in and out, different toe in and placement. Don't ever buy speakers without auditioning with your amp and, if possible, sources. I know this sounds like a PITA but there's very few practical sides to this hobby of ours.
Happy listening.
