What do you use for you MVPs?

Hi all! What tools/framework do you all use for your MVPs? And why that specific framework/tool? We have always used Rails. but its good to re-evaluate the options from time to time.

Some points that I would like to put in consideration:

• Time to market (how quickly can you set something up)
• A way to grow after the MVP stage (can you grow from it, are there options to keep moving faster)
• Hosted vs self hosted (can you host it on your own infra)
• How's the community?

Ideally I am looking for something that is also able to grow a little beyond the MVP phase. Somehow my MVP's always end up needing things like data import, csv import, user management etc.

Would love to hear what you are all using =)

Cheers!