Ive been a satisfied subscriber to Mobicips browser service for 3 years. The filtered replacement browser is a must-have for any iDevice used by kids. You can do the basic setup on the web site by selecting a filtering profile, and then tweak and tune it to your liking. Used in conjunction with the companion Monitor app, I get notifications when my child tries to access a blocked site and can then approve it (if I want to) from my phone similar to iTunes purchasing approvals. The weekly summary reports were helpful to get an idea of usage, sites visited, apps installed, etc. My daughter would occasionally complain that she thought the filtering was too strict at times, but better that than the alternative.
The few times I did have issues (like missing reports), support was very responsive to e-mail. Ive had to move the subscription across multiple phones durng my subscription and never had a problem, just a quick e-mail to support and the new device was ready to go.