I also have a HP35S which is a nice compromise and not bad for a modern device.
Although a bit more cumbersome to do base conversion when compared to my 48GX, the 35S is quite nice. (I leave my 48GX at home as I am afraid it will be stolen).
The base conversion aspect is my biggest dislike on the 35S.
Some other comments...
I recently got around to getting a WP-34S, and I'm really liking it despite the fact that some of the common scientific functions aren't primary key operations. My only calculator with a direct Log base 2 function. It also has a satisfyingly complicated looking keyboard, a key requirement for any self respecting nerd.
I agree about the apps on phones, or indeed tablets or a PC, I find that the user experience is compromised badly.
do you still have an actual use for a standalone calculator in your everyday life
Yes, several times a day, both for programming and electronics. See my note above about user experience. It has to be sitting on the desk permanently, if it's kept in a drawer it's far less likely to be used.