Marcy PL-43211 Upright Mag Cycle Review

I have been generally just a walker.  But in the last year I have been having knee pain.  I learned from a physical thereapist that the best exercise for my particular problem would be to bicycle to strengthen the muscles around my inner side of the knees.  I bought this bike on Amazon after researching a little bit on various sites.  I just wanted something small, simple to use, and basic, as well as affordable.  This fit the bill.  Some of the reviewers on Amazon seemed to have difficulty putting the bike together, but we did not, even though the tools mentioned as being included on the box were not included.  Once we had it together it was simple to adjust the height for me.  There are 8 levels of difficulty.  I started out at about a 3 or 4 and make my way up to 8 during a workout, then wind back down to the 3 or 4 at the end.  The main thing I noticed is just how quiet this thing is.  I can do this before the kids get up and they won't be woke by it, it's that quiet! It could have higher levels of difficulty though.