worst arfs i owned were the lower end sportsman aviation arfs. bad covering jobs on them .i bought them because they were inexpensive. i've been told their higher end arfs are much better. but my worst one (believe it or not) was the tower hobbies kaos .40. it was covered in towerkote and it was a really bad covering job. the covering started coming loose everywhere on it shortly after i started flying it. it was not the covering, but the poor way it was applied.