Just like Glen, I’m using HS8s. The reason for the bigger speaker is because if you look at the frequency responses between the ranges, the 8s are slightly more flat. Which works for me in my room, tbh I’d say any speaker your used to is a great speaker. You just need to know it’s quirks which just takes time.
Ironically I’ve been getting to know mine all over again as I recently moved rooms (and houses). I started to get to know them again a few weeks ago and then noticed a slight delay between the speakers… at that point the room wasn’t treated at all but on my right hand side is actually some curtains that are always closed when I mix, there also dead space behind them before the window. So I quickly realised that one of my first reflection points was treated by the curtain (ironically) and the other wasn’t… which has been really throwing off my mixes… I mean my bass end was non existed in bounces, the mixes were one sided and the verb was completely over done in every mix I did. I ended up sending my mixes to a producer to send me feedback and just go off that, luckily this redeemed me before I sent the pieces to my clients. Around 2 weeks ago I bout a pretty hefty acoustic panel for the other side. Man, my mixes are back to normal and actually a little better than in my old room.
My speakers weren’t the issue… if I have ever had issues it’s always in my knowing how my speakers react or my room…
Having said that I actually really like the personus Eris range… i know they’re cheaper and not genelecs but every time I’ve used them I’ve had awesome results and that’s all that matters. Used to have a set of Adams and genelecs in the college where I first studied… they were ok… ironically I preferred their cheaper speakers there too which were KRKS. These days those speakers are frowned upon by a lot of composers but the frequency response on them even today is quite good I’d say. They usually got me good mixes anyways… except they were only 5” so the bass end was always a little off. Not the brands fault though.