I owned the 228be for about 1.5 years and demoed the 328be both with and without the revel subs.
it is a good speaker that sounds as good as it measures. The reason to buy this speaker over others is the very smooth (extremely smooth) frequent response and wide even dispersion. It is a really easy speaker to live with but maybe not the absolute best at anything. If you find you don’t like other speakers because of a wart you nitpick the 328be could be a good choice as they are wart free.
The mids are comparable to any other highend box speaker, transparent and neutral. The highs are a bit softer than some other brands (focal etc) but just as detailed. I however find the bass extension a bit lacking for its size but fine. You really need boundary reinforcement to get down low. If pulled out into the room you might still want subs (I would) but in a smaller room 2-3’ off the wall they might be ok. I had my 228bes 5.5’ off the wall and highpass to subs at 60hz. That there is the issue for me. Once running a sub system you could almost just buy the 226be as they sound very similar and save a lot of money. I do think the larger tweeter motor of the 328be and does translate to better highs (just a touch) than the 228be/226be. I also think the 328bw highs are tuned just a touch softer.