Heathen that I am, gonna play devil's advocate. Pc is much more stable and has more interaction and features than mobile; however, mobile is convenient for persons who are often out and about but want to be able to stay in touch.
I am out of the house most of the day but I can still chat, shop, room hop, and snap cute pics.
All of the basic functions are available via mobile and each update seems to bring us closer to a better sync between platforms.
Yes, there are significant issues with still bumping others when entering a room.
My biggest issue with mobile and rooms is the inability to check my kbs. I normally just save outfits on pc that I know are under 2500kbs. If I enter a room and I'm unsure of kbs, I simply ask if someone would be courteous enough to check. It's usually not a huge issue.
Overall, minor inconveniences but mobile isn't as bad as most people make it seem.