I have purchased arrangements for several years and found them to be very well written. This year, I chose the wrong key for one of my songs. It just didn't work well for my students. One email and they sent my the other version with a very understanding cover letter. Wonderful to work with!
Strengths
When you get your arrangement you will have everything you need to teach your song. MP3 practice recordings for each part are included. This makes learning in school so much faster.
I recommend ChorusOnline.com