Very impressed with how easy my update went: fast/flawless! Arc has been working very well since updated a few days ago and I definitely notice increase in speed/smoothness ('buttery') and like the new features 4.1 brings.
The amazon one mentioned above is very well spec'd and gets good reviews. I went with the Kobo Arc because of how open the tablet is re: I can use Amazon Kindle App. and any other reader and I have access to tons more apps etc. I do not like the way Amazon locks you in... best to make sure hubby does not either