Are butt implants uncomfortable?

Depends upon when and who you ask. It is indeed a painful surgery and initial first 2-3 weeks of recovery. The first 2 weeks is the most challenging with swelling, tightness, and discomfort. Also sitting is prohibited for these 2 weeks. Patients may return to work after 2 - 3 weeks as sitting and basic daily activities become easier.  For those whom work from home, return to work resumes much sooner if they can work standing, kneeling, and/or lying down reclined in the "dentist chair" position. After 2 weeks patients may sit for up to 30 minutes at a time then stand up or take a short walk for 15 - 30 seconds before sitting back down, 3 weeks for up to an hour, and at 4 weeks unlimited.  At 3 weeks patients can resume upper body exercises while standing only, at 4 weeks upper body exercises while seated may be added.  By 6 weeks, all restrictions are lifted as life nears normal again, all exercise (including squats and lunges) and sports may be resumed again but at low intensity. Like breast implants, around 5-6 months postop the body has adapted to the implant as a foreign object so it recognizes it as  self. 
On the other hand, if you ask a surgeon that does not perform buttock implants, you will hear all types of false horror stories. 

Thank you for your question! My patients who have had buttocks implants done by myself typically are very comfortable after surgery! Best of luck!Dr Dhaval Patel 
Double Board Certified
Plastic Surgeon 
Chicago 
Hoffman Estates 
Oakbrook
Orlando Park

if your implants are placed properly by a qualified surgeon your implants should start to feel like part of your body after about 1 month. You should not have any irritation or any discomfort after fully healed. Please be sure to choose a board certified plastic surgeon who specializes in this procedure and is well know for it.