In regards to Taric I think the changes do a pretty good job of filling out his niche and I'm pretty pleased about it as someone who mained him leveling. I think just by the nature of his skillset he'll probably always be the worst teamfighter of the supports -- one control move means he's not going to compete well with Alistar, Janna, or even Sona in that department, and his sustain is pretty weak compared to the other four main supports in a teamfight(though Taric is slightly better now in that with the Shatter and Radiance changes he can at least be an Aurabot a bit), and his damage lategame is still bad due to lack of farm like the other supports... though even then he doesn't scale as well as Janna or Soraka.
What I think this patch does a good job of, though, is make him the best offensive laner now (even better than Alistar since Taric supplies a decent bit more damage on his own). He had some nice aggressive lanes before with some notables like Caitlyn, Vayne(who I liked better with Alistar before but), and Cassiopeia and it's only going to be easier to get kills in those lane now that Radiance adds a meaningful chunk of damage during the second half of the laning phase(and in Cass's case that it adds AP instead of just AD now). The changes to Shatter kind of support this too even though the damage drop hurts more than the cooldown helps in regards to bursting people down(especially since it's too mana expensive to really exploit that to harass...), since at least now you're not putting your carry in unnecessary danger when you use Shatter to go for a kill. I think it makes a lot of other laning partners make more sense with Taric too, since if you have a partner with some CC and you coordinate it well you can Radiance->Shatter->Dazzle from melee range now that that gives the same stun duration as using it from range and then the whole combo is like a 25% damage output boost from what Taric was doing during the Talon patch because you get the benefit of the new AP aura on Shatter and Dazzle. I like him with Ashe a lot more now in particular, level pretty easy to set-up a kill at 6 or 7 now. The changes aren't going to change Taric as a character much but it makes his laning phase even better to compensate for his sketchy lategame, and at least he can support his team better with Shatter and Radiance's auras now... it's a pretty good solution, I think. It's a pity it's not more feasible to get some AP on him as a support to help out offensively a little more, but ah, well... I think I'm going to start going Philos->Kage's and running a couple AP blues and reds to improve the burst a little at low levels. I think Taric is still someone you really need to win the lane with to be "worth it" but I'm a fan of the changes.
I haven't played her since the patch because I was pretty busy yesterday but I like the little change to Sona's heal, too. The one thing I complained most about when I saw the support changes last patch was how hilariously bad her heal was at level 1 and to a lesser extent level 2(what the FUCK is a 25hp heal. seriously), especially since her laning phase is pretty much a disaster if you don't get a couple points in her nuke early to prevent it from being too easy for your opponents to harass. I'm glad to see the heal restored to reasonable levels at the beginning of the game, especially since part of the rationale for nerfing all the heals last patch was late-game scaling which Sona couldn't do to begin with. I felt like I was having to play more aggressively than was wise during the Talon patch as Sona because if I just let them whittle us away I couldn't keep up if my carry didn't let us get pushed to the tower(and if they didn't have a comp that could just dive us there), which should be remedied by this seemingly minor change. I think Sona is in a really good place right now, the bugfixes last patch were a big help and now I think her numbers are about where they should be.