I have a yellow streak. By far our family favorite, with a personality unmatched by any bird I've yet to own or work with. That said, this species is a very intelligent, fun-loving, high energy friend. If you are not willing or able to provide several hours a day at a minimum in quality time with your lory, plus spend the extra time with the daily cage cleaning and preparation of the low iron, fruit and nectar diet, you would be doing your bird a grave injustice.
I would not call this bird a loud bird in any sense. Even with her,"Cat, get away from my cage!" scream, our Baby-Girl's volume is nowhere near our nanday conure's medium-strength "hello" squawk, and his "play with me!!!" scream drowns out Baby-Girl altogether.
Our lory is a chatterbox, happily making an almost electronic double cricket-chirp while playing, "talking" in a little mumbling voice while on our shoulders (she has never gone poo on me since I first held her in 2007 through today, always flying to her bird-gym floor to do her business. She is just as neat in her cage, dropping to the cage floor to go, then flying back up to her perch. I've worked with lots of lories, and she is the only one I've ever seen this unsolicited behavior from).
If you have the time, love, and patience necessary to keep your lory psychologically happy and it's habitat nice and healthy, you will be rewarded with barrels of love. Whether you want to teach him tricks or just love on him all afternoon, you will not be disappointed. Plus, since yellow streaked lories have been known to live as long as 28+ years, you will have a friend for a long, long, time!
I hope this helps!
Thomas