I'm in the middle of mixing my first 5.1 film score, using LSR2328's as LCR with a 2310 sub and 2315 Ls Rs. I think they are great for the price, and work extremely well in my 25m2 size control room. I've only used them for a couple of weeks, so it remains to see (or hear) how well they translate to the real world, which is mostly what matters :-). My experience with other 5.1 systems are rather limited, so please take it FWIW.
I too have used LSR28P's the past, I absolutely love these monitors, even though I retired them for Adam S3A-X. The LSR2328 reminds me of the LSR28P, in fact I bought the 2328 setup based on what I knew about the LRS28P. The LSR2328 has a bit less low end and a more open mid range than the LSR28P. The low end is not a problem with the LSR2310 sub.
I would have loved to have a complete LSR28P 5.1 setup. Anyone selling ? :-).
BTW, this is my first post in the Post Production Forum here on GS. I've spent a lot of time reading this forum, books and listening to 5.1 mixes the last months, and would just like to say thank you to all who contributes to this forum. I've learned a lot from you so far, hope I can eventually contribute something back. I'm coming from the 2-channel music mix world, but seeing more and more work in post and 5.1. I find this a fascinating, exiting and challenging world :-).