I'm using the S.A. kit with (all)Refinements components, Virtue, Rogue Rebalancing, Ascension, and Tactics mods and the BD fixpack. No real bugs or flaws to report. Just how the kit handled against improved opponents(from the Tactics mod in this case) and my impressions of it. I'll try to keep to the point but bear with me, sometimes I go off on a rant.
This kit...I love it! Well thought out and developed and has definite potential, especially when the HLA's become available. Their being able to use (most)bracers and gauntlets, as opposed to Kensai not, was a great addition. So what if it makes them a little harder to hit, etc.? I think they are an even trade-offs for exposure to critical hits. I was glad to see them Immune to Fear and Morale failure, that goes without saying.

I wouldn't do otherwise, but in the interest of testing and if time allows I'll go back and dual to a mage.
Proficiencies: *** in Katana(My blade of choice. Keeping the chance to stun of Celestial Fury in mind and the single-sided blade goes well with the kit)
* Quarterstaff and ** in Single Weapon Style
Started off with: Spiritual Harmony x2, Lay on Hands x1, Merciful Fighting On/Off(The animation is perfect btw. Visible when surrounded.), plus Draw Upon Holy Might x2, Cure Light Wounds x2, and Slow Poison x2. Refresh my memory, if need be, but were the last three Bhaalspawn powers from BGI?
So far so good? Let me see, what else? Oh, yeah. I mentioned me going off on a rant sometimes. Here's an example: Irenicus' Dungeon....It took me 3 days and 23 hours in game, I don't know how many real-time but it took three days, and 40+ clicks of the reload the reload button. Most(but not all) of these were because of Ilyich and Comrades' improvements by Tactics. I wouldn't mention it except that the S.A. made the difference in the fight after the usual tips and tricks didn't seem to work. I spare everyone the details...most of them I don't recall...but DUHM + Spiritual Harmony + the appropriate weapon = dead golems.
*The other reloads and the long time spent in the dungeon were from the inability to disarm traps early in the game. This taxed the party of healing potions(left the dungeon with 3. IIRC I picked these up after the fight with Ilyich) and forced me to rest constantly. This almost defeated the purpose, since a Durgear Proletariat and Mage showed up every time(and didn't even have the decency to bring coffee!

Point to make: The improved dungeon is beatable using the S.A. without cheating. It was no fun by any definition, point of fact: It was a Pain in the A$$. Classic argument for using 'Dungeon Be Gone'.
Comments, observations, etc. on the Sword Angel:
#1- Merciful Fighting(sorry if I don't abbreviate here

#2- S.A.'s missle weapon restriction, like the Cavalier and Kensai, doesn't apply to throwing axes and daggers. No bother though.
#3- I noticed that the PC and Yoshimo took a -1 penalty to AC when dual-wielding. Again, I don't know if this is a bug or not. I haven't read through all the doc's of the mods I've installed yet(I did see the part in the kit doc that mentioned them almost being prevented from dual-wielding)
#4- A little nitpicking-- I thought it was kind of odd that S.A.'s cannot go beyond 1 point in Clubs. Clubs, by design, are really defensive weapons. You really have to try to inflict a mortal injury with one. Again, no big deal. They're not a weapon I have used much, with the exception of Bone Club +2.
Thoughts for future improvements:
*Blunt weapons: Kit-specific, or the ability when using one, that has a chance to Slow(broken leg), cause a severe THACO penalty(broken arm), or Stun(broken head).
*Defeating opponents without killing them. I saw the posts discussing this from a while back. My solution, I don't know how feasible it is: - Undead get hit by certain weapons and destroyed outright if they fail a saving throw. What about (while the Merciful Fighting is activated)just 'killing' opponents and getting the xp and whatever they're carrying? Only replace '<enemy name> Death' in the display with something less permanent, like 'Opponent Vanquished' or something.
I know I forgot something..... I'll edit this post or include it in the next one.