Easy setup, fast, randomly restarted twice... the first day...will keep a watchful eye.  If this continues to happen after problem solving, I'm dropping the rating and it goes back!  If it pans out, I will adjust the rating and add how it was stabilized.5/18/21 Update e-mailed back and forth with tech support.  Restarting issue resolved by having Me remove and clean all RAM sticks with an eraser.  One RAM memory stick is defective.  Now running on 3 of the 4 RAM memory sticks and no random restarting.  Now I'm waiting to see how I get my faulty memory stick replaced.  Also, I bought this tower on April 17th.  I haven't been able to use this without it restarting while I'm working on something until today!  7/5/2021 update:  this %=×/\ thing has been taking up to 10 minutes to come on for the past few days.  Today, it just froze at the Dell Optiplex screen.  After an hour, I had to do a hard power down.  I contacted the seller.  I only have a couple of weeks before the return window closes.  This will likely go back! It's been far too frustrating and disappointing!8/12/2021 - Update.  First of all, AWESOME customer service.  As you have read above, I had some issues with the first one I received.  Customer service worked with me and shipped a new one out and provided return shipping for the defective one.  I have had the replacement for about a month now and it has worked without issue and I am happy with my purchase!  It does everything I need it to do and the setup was, again, extremely easy.  I haven't installed Windows 11 on it, yet - crossing my fingers and hoping it is compatible.  So much for Windows 10 being MS last version of Windows!  Once again, GREAT customer service and incredible for the cost!