I have this bike and I like it. My husband and I don’t use it super often (1-2 times a week), but it gets the job done. I’m 5’9” and about 210 pounds and it feels stable to me. My husband is 6’ and 215 and also has no issues.

I have a cheaper folding bike, and it’s fine. Nothing like going to a spin class, but I can get some cardio in. Just ordered a spin bike though, because that is what I really wanted.

Edit: This bike. https://www.amazon.com/XTERRA-Fitness-FB150-Folding-Exercise/dp/B01LYFWKMH/ref=asc_df_B01LYFWKMH/?tag=hyprod-20&linkCode=df0&hvadid=216514740623&hvpos=&hvnetw=g&hvrand=15729806544959315783&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9002012&hvtargid=pla-351582207548&psc=1

I’m 5’3” and it’s definitely good height wise. Very sturdy. I can’t stand up and pedal though.