Loegria is a wonderful library, one of my favourites. I have a whole heap of other libraries, strings especially, but I still use Loegria often. Especially for underscore or softer pads, backing for other solo instruments and such, it just works.
The main standouts are the Strings and the Horn/Euph patches. The strings especially with the con sord, the flautando and the 1/2 sections are simply beautiful, nothing compares. But the whole lot is excellent when it comes to the strings if that style is what you want. It really is beautifully recorded.
Don't expect the legato to give you anything fast (it will give you some odd quirks if you try), but when I have slow pieces I really like the legatos, especially given you can change the speed down to be a longer more natural legato in the interface. This works especially well for the low strings.
The shorts are good too. Nothing snappy or tight, but there are short lengths in there like the staccatos that I can't achieve with any of my other string libraries. They have a soft quality to them, and some are longer in length than standard, which most other libraries don't have. I've used the low shorts a fair bit because there's nothing else I know that does that. The pizzicato is fantastic too, both high and low sections.
I don't think some of these same qualities exist in SCS, it definitely adds a different element than SCS does for small sections. It's a different sized section too, slightly larger I think, so it is more easy on the ears sometimes than SCS, especially with the vibrato. Personally I like Loegria more for some of these specific patches compared to SCS, but that's just me maybe.
And I don't think anything beats the Horn/Euph patch for warmth and tone. I really wish there were more articulations. It matches very well with some of the Albion 1 legacy brass too, eg. the mid brass.
Whether it is "worth it" depends a lot on whether you would use this smaller / softer approach to ensemble instruments.
(I'm ignoring the disservice they did to those recorders - what were they thinking!?).