Naim Supernait vs XS vs Exposure 2010s

I have a Nait XS, and compared it extensively with a SuperNait, a Nait 5i, and a Creek Destiny. I owned a 2010 for about a month.
The 5i and the 2010 perform at about the same level, with the 5i being "better" to me, in that it was more revealing of musical nuance. The 2010 sounded pretty harsh to me. Now, I will say that my point of reference is my ARC Ref series gear which is pretty smooth. I enjoy playing with the integrateds because I love the concept, and just love to play with audio gear... That said, I think the Supernait and the XS are about the same level product as each other, if you don't need the dac in the Supernait, get the XS. They both have MUCH more drive than their ratings suggest. As mentioned, I also owned a Creek Destiny amp. It was more transparent and "open" than my XS, but did not do musical nuance, and make the music "of a piece" nearly as well as the XS. Despite the 40 wpc difference in power rating between the Destiny and the XS, the XS had much more grunt and drive. The XS has plenty of transparency itself, just not as much as the Destiny. I kept the Naim XS, and sold the Destiny. It is the classic audiophile resolution vs musicality debate. But you asked about the 2010... I guess I would say that all of these are priced appropriately in my opinion. The 2010 performs like you would expect at the price point, which I believe is around1200-1500 if memory serves, the XS and Supernait are quite a bit more expensive, and well worth the extra cash imo.
Be aware that the Naims really DO take a long break-in period, a month (of play) at least. They run cool, so they can be left on. Once they are broken in, they can be turned off with a normal turn-on warmup (30 min.) only required to sound great. I am using a Nordost Valhalla cord on my XS, and it fully exploits the quality of the cord. It really lifts it to a high level. Also, the XS is the first piece that MUST be plugged into the wall. My other gear, including my ARC gear, benefit (or at least don't suffer from) being plugged into Audio Magic Stealth conditioners. But the XS sounded a bit dead into that. It is a really cool, fun to play with piece.
It sounds like you like to have a variety of gear around, to include tubes and solid state. I am the same way, and I find the Naim route is yet another avenue to satisfaction. There are tubes, there is solid state, and there is Naim. It is a different mode of musical delivery than most solid state or tubes. I see now why they have such a rabid following.

It was the 2010S. As I said, it was fine and priced appropriately, but the Naim XS is much better. I will say that Realhifi has more experience than I, since he is a dealer, in comparing the Supernait and the XS. My experience with the XS, 5i, Exposure 2010S, and Destiny were all in my home, but the comparison with the Supernait was in a showroom, so I would have to ad that caveat...
That said, I cannot imagine the XS being "soft". It is smooth, but not soft, and very dynamic. I recently added a Hi-cap XS to mine and it lifts it again, to really a very high standard. I loved it before, still do, but check out a Hi-cap and prepare to be amazed, again.
I know in absoulute terms that my ARC Ref gear is more audiophile-ish. But the Naim gives me a satisfaction that I have not received with any other brand, and I have tried a lot of brands...
On the soundstage front, I would be shocked if you did not find the soundstage acceptable in the XS by itself, with a Hi-cap it is VERY impressive.

I am still getting used to the Naim vocabulary. It is not a Hi-cap, but a Flatcap XS. They are less expensive than Hi-caps. There are improvements across the board, from soundstaging to drive to transparency, without losing that musicality and nuance of the bare bones unit. Every instrument in a group stands out a little clearer.

The only Shunyata PC I have is a Black Mamba which I use in a digital piece, so I don't have enough experience with Shunyata upper level products to compare. When it comes to losing musicality, at first I thought I did lose some because with the Valhalla PC the detail gets ramped up quite a bit, on just about anything, including the XS. So you start to concentrate on all that detail... After getting used to it, I don't feel it loses musicality. Comparing the effect of the Flatcap vs. the Valhalla, hmmm, I would say the Flatcap may have the bigger impact, but it is very close in my opinion. That may change as the Flatcap is quite new and breaking in. I can say they both have a pretty big impact for sure. I have the Valhalla on my XS, and a Synergistic Master Coupler on my Flatcap. Fun stuff!