Ive sort of given one a run, Muhlrondi human/half Celestial, level 11 cleric of Bast with the temprement that could be best described as "gettin old testament on their arse" type of personality. The extra mobilty of the wings lets me as the party combat medic try to get in where its needed and its quite a savage little beast as far as melee and blowing the crap out of things. Add in a few fire-resist buffs and laugh at enemy arcane casters try to nuke you... though energy drain and 'insta-kill' transmutations can ruin your life like anyone elses.
So far my caster level hasnt been too bad, though come around level 18-20 I think it could end up a bit of a "gimp", like most things around that level in D&D it starts comming apart and needs some propping up with house rules.
As for ECL?
Well, most of the ECL's Ive seen WoTC churn out to be slightly 'underpowered' and erring on the side of being slightly weaker in the long run and some just suck!
Just about any thing you can get as an inanate you can buy with cold, hard gold or manufacture. Trust me, as you get higher in levels the more you will rue missing a level or two behind the rest of the party and sit back and watch as someone picks up/makes an item you paid 2 levels in ECL for, exceed your own abilities can be disheartening.
But, if through your actions you can make a character that to you is at least unique and loveable then thats what matters in the end I guess.