Thanks for all the feedback. As I expected there's a wide range of opinions.
I guess I should have mentioned at the top, I'm not a professional songwriter, I post songs on SoundClick (80+ songs at this point), and make CD's with professional looking covers and booklets. I sent my CD's to my brother and he's a very negative person who rarely compliments anyone. He surprised me when he said, "I'm really impressed".
I asked him, "So you liked the songs?"
He said, "No I haven't listened to them yet, I was just talking about the packaging."
(I did do all the artwork myself)
But I digress. I think I mentioned about 30 - 40 percent of my songs use some kind of construction kit or EZkeys piano tracks, but I always try to make the song my own. So if someone listens to it, who is familiar with the construction kit or the EZkeys parts, I want to make it hard for them to identify with any parts that I didn't create myself. I think I've used complete construction kits (with all the parts) only 2 or 3 times in a song.
But again, I'm not a professional, I'm not looking to profit from my song writing. But I am thinking of getting more and more into producing local singer-songwriters songs. I've done that a few times with great results. And I'm planning on advertising locally as a small studio producer to work with local talent and create fully produced, mixed and mastered songs from their piano or guitar and vocal parts. I wouldn't be using any construction kits when producing other people's work.