Last Baro of 2018, did he bring good stuff?
Axi A5, Harkonar Wraith Legs, and Solstice Syndana: My opinion on these hasn't changed too much since he started bringing them, I don't think they're worth it.
Fanged Fusilade: Not a particularly important mod for most builds and if you ever get into Eidolon hunts, you can pretty easily acquire this and the other slash mods in the set. Easy pass.
Vermilion Storm and Astral Twilight: Good stances, but once you start doing Kuva farming you'll have more of these than you know what to do with. If you're still pretty far off from Uranus and the Second Dream these would be worth grabbing, but if you're doing your Kuva stuff, just wait for them to drop.
Tempo Royale: Buy. It's a very hard mod to farm for with a low drop rate, and it's arguably the best stance for heavy blades in the game. Absolutely worth the ducat price.
Prisma Angstrum: I love this gun so much, it's an explosive launcher that lets you charge up the number of rockets you'll fire when you release the attack button. You will probably very easily blow yourself up with this gun if you're not careful, but the damage is awesome for covering wide open areas. Borderline MR fodder with a place in my heart.
Prisma Grakata: An excellent bullet hose primary with great crit stats. If the Soma Prime is too boring for you, spice up your life with a little daka.
Twin Grakata Towsun skin: The Towsun skins are some of the nicer looking skins from DE. Worth every ducat to grab if you're a fan of the Twin Grakatas.
Prisma Uru Syndana: The prisma effect trails down around the end of the scarf and looks great. Strong recommendation from me if you have extra ducats to spend on the cosmetics.
Ki'Teer armor: I would generally say pass on these. They're really bulky and don't fit many warframes, but you might have a different opinion on them. At the very least I do like the chest piece for the dumb hologram of the Ki'Teer diamond and some nice metallic color channels.
Nexus Fur Pattern (Kubrow): A great fur pattern for Kubrow if you've been unlucky farming those Lotus Kubrows.
Ki'Teer Arrow skin: Unlike other arrow skin offerings, this one is a cosmetic adjustment that isn't a consumable. It changes the look of the arrow and gives the light trail a different effect, a trail of Ki'Teer diamonds! It's pretty fun to use, especially with the Cernos Prime firing multiple arrows or any of the automatic crossbows.
Anpu Sugatra: Probably pass, sugatras aren't usually very noticeable and this one isn't particularly noteworthy anyway.
Mantis Prisma Skin: If you use the Mantis ship you owe it to yourself to get this skin. The Prisma ship skins are all good.
Ki'Teer Kiddo Cosmetics: Probably pass, though the Atmos Earpiece is a hilarious attachment to stick on your operator.
Ki'Teer Glyph: Probably pass.
Inaros Tomb Scene: Really, really nice scene for shots in Captura. Worth getting for that mode.
And as always, grab the Inaros quest if you haven't.