What would you recommend as an off-the-shelf solution for getting customer feedback on product?

A generalized question can only get a generalized answer. The most significant accomplishment is validating that the product you have built is a fit with your target market. This is demonstrated primarily by engagement (the people who sign-up or who previously visited, continue to return) and secondarily by growth, ideally based on word-of-mouth or viral growth but effectively converting paid traffic is a great second prize. Other significant accomplishments include: Not running out of money Recruiting and retaining great talent who believe in the founders' vision. Your loved ones not thinking you're as crazy as they thought you were a year ago. I'm happy to talk to you in a call to give you more specifics about what you want to set as your goals more specific to your startup.

If I was just starting out, I'd consider learning Meteor (https://www.meteor.com/). It's just entered version 1.0 and after working with it for a little less than a year I do have some issues with it but it still makes for a very solid framework that gets you up and running very fast. You would only need to learn Javascript, and you can slowly work your way towards nodejs from there (which Meteor is based on) if you want to, or you could get the basics down and focus on learning design if you prefer.

If you haven't fully tested your app with the 100 individual accounts Apple allows you to test via TestFlight or Hockey, then I'd suggest you should test thoroughly with your email list before launching to the app store. Things to look for at this early-stage: Activation and Breakage Points: From app download to user onboarding, where are people getting lost? Your goal is not only to have them download the app, but complete whatever steps for them to become your user. Optimizing the flow to ensure maximum conversion is a key first step. Engagement: How often are they completing the tasks you deem most important based on your business model? How can you increase this number? User Understanding: How clear is the app's UI and messaging? Where are they getting lost? Virality: While true virality is hard to measure at this stage (given the constraints of pre-launch testing), you can evaluate the potential effectiveness of any distribution tactics you might employ (contacts, OAuth's etc) in terms of user opt-in and conversion issues. Real analytical data is easier to interpret than user interviews but there is a such a treasure trove of good customer development intel from customer interviews. Those first 100 people who download the app should be personally interviewed about their experience, what they like, how much it solves their problem, how much of a problem that is for them in the first place and so on. Before you go live in the app store, I highly recommend you max out your installs in a private testing environment. I'm happy to talk this through with you in more detail in a call.

Find apps that are B2B and go to the review sections. Specifically going to Google's play or Chrome store and look at reviews and follow them to Google+ to engage. I took that same angle for B2C app I was building last year. Check it out. http://blendah.com/post/37331434653/lean-startup-hack

I have built several multi-million dollar businesses using (2) very simple questions: "What makes you say that...." and "Tell me more...." No matter what someone says to you, you just keep asking one (or both) of the questions. If you do it 4 or 5 times in a row you'll learn everything you ever wanted to know.