Ridgid was the mfg of most of Craftsman (Sears) table saws, etc for many many years... So to say that Ridgid tools are a copy of Sears is kinda sorta backward...
I never knew this until I began doing a little research attempting to dig up a manual for an older Craftsman TS that I had...
I have a Ridgid 1300 planer, 6" jointer, Oscillating spindle sander and I still have my 3650 TS (which is for sale). The 3650 is an updated copy of the late 70's / early 80's Craftsman TS that I have... The trunions, motor mount, carraige, etc etc are nearly identical.
The planer is a good piece... I have not had an issue with it and it just keeps on chugging... I haven't even had to replace or turn the knives over yet and I've fed at least 300 BF or soft and hardwood through it... The jointer is just about like every other 6" jointer out there that are branded under various names (jet, craftsman, delta, etc etc). Honestly to do it over again I'd just skip the 6" jointers and go right for an 8" model.
The spindle sander is a nice little unit... Comes with a lot of bells and whistles for most projects... But what it isn't is a big sturdy CI table spindle sander... If I get too aggressive I can easily deflect the spindle and get and non-perpendicular sanded surface relative to the table...
the 3650 IMHO is a very good saw for the price... Never had and issue with mine and I feel sort of bad that I've pushed it to the far wall and out of use in the shop in leiu of a new Hybrid TS. Hopefully it finds a good home soon