I'm not the best person to answer about bootstrap on our team, but I'll ask my colleague to add a comment about this later.
Redis is fantastic. Perhaps I should also mention we use ohm as an ORM, which is very neat. I wouldn't dream managing our particular app without it. But it's not exactly fire-and-forget. Firstly, modelling your data is very important, or you can end up with lots of stuff taking precious memory. Secondly, whilst performance is great, it's still not 'transparent' like accessing a variable in memory. If you have lots of small redis queries, they do add up eventually. This is getting very detailed, but you might want to check out this as an example (specific to the ruby version it seems): https://github.com/redis/redis-rb/issues/283
Hope this helps, but feel free to get in contact.