I don't have much to say about the Poolside Splash kit, I guess it's nice to have more swimwear options, and most of the items look good (except for the sunglasses maybe, but I have an issue with glasses in general in this game, the proportions and placement always feel a bit off). I don't use pools a lot personally, so if it's the same for you, this kit is clearly not essential.
Now, about the Modern Luxe kit. This kit includes some very basic elements that I could see myself using everywhere, like these perfect modular curtains, the small record player, or the cushion that can be used on sofas with moveobjects (I've tested a bit, the sofas remain functional). But because they're part of a kit with a very specific style, they have a very limited selection of swatches. I'm talking about the curtain, for example: if I don't want a gold curtain rod, I only have… 3 swatches available. That's why I'm a little frustrated that they've included them here, and not in a patch, or in a larger pack with a more basic style. Hopefully we'll get more of these at some point, with more color options. Speaking of styling, although it's not really my thing (but that's only a matter of personal taste), everything looks great (but once again, I wish there was more color options, without the gold), but the items from the Vintage Glamour SP and the Get Famous EP have a similar vibe. At last, these new items look much better proportioned, and I can see myself using most of the decorative items.