Though there were many testimonial posts from members in Forum and even in Article section, an exemplary testimonial I found was from a member who was with ISC even before you and I joined ISC.
I quote relevant portion from the thread dated Ist July 2010.
"Previously, I used to mug up English compositions, grammars or letters during my examination time, but it fetched me no sweet fruit of success. I was in wonder of how to improve my language skills in English. Competitions like Debate, Essay Writing Competitions were of no value to me in schools, and used to think that I was of no comparison to others.
After several days passed, I found ISC one day when I searched for topics of Project given to me in school. I thought such high level English focusing site would rathar bear me any positions. But soon, when I started my work in ISC with Article-writing, writing reviews, posting businesses and helping members in Forums, I noticed a great change within myself.
Within a span of three months time, I had become more fluent in English and have started actively taking interests in activities in School which related to English skills. I was in a worry of exams in English earlier, but now I have topped in my English exam recently 15 days back. ......" Unquote
Recently, in your thread post on completing nine years in ISC you also stated "I could improve my English writing skills to a great extent that helped me to be a creative writer."
I cannot claim nor blame ISC on or construction errors. But as they say, 'somehow pulling on'. However I have to admit that I had gained a lot from ISC by the quotes, vocabulary and grammatical issues shared by members in forum and the leads from there which prompted me to refer more and learn.