The main thing that concerns me regarding Liberty Shield, is there is very little information regarding the vpn protocol they employ, especially given they appear to provide a "you can have any colour, as long as it is black" kind of service. Digging a little bit deeper, it seems (from their installation guide for dd-wrt routers) that they employ pptp, which only quality is quick because it is simple, but is probably the least secure / most vulnerable vpn protocol, and therefore not recommended. See e.g.
https://www.ivpn.net/pptp-vs-l2tp-vs-openvpn
Another issue that concerns me regarding Liberty Shield, is how come there is no detailed info on the one and only preconfigured router they sell? Is it user configurable, and for what other (competing) vpn providers, or services if and when I feel like it? Indeed what sort of performance can I expect from that router running OpenVpn?
One of the reasons the above questions are relevant, is that Liberty Shield's vpn service is not particularly price competitive (ok I admit I am tight...). The only decent price they offer currently is the £35 annual sub based on half price for the 1st year. Their marketing strategy is therefore just like Sly/Virmin, who will happily sell you, as a new customer, their entertainment package at steep discount for the first year, but will hit you with the full price the year after unless you leave, or threaten to leave - if you leave Liberty Shield vpn, does the shiny preconfigured router you have bought from them turn into a paperweight/doorstop?
To my mind one must be able to trust one's vpn provider - because unless you are minded to put additional security protocol in place, they will/can know everything you are trying to keep private. That to me means one must also be able to move freely between competitive vpn providers. The supplier of my router assures OpenVpn compatibility and support for 20 major vpn services. Liberty Shield is not one of them.
Having said all that, I do get the value of preconfigured vpn router/services for technophobes, or for those who are happy to pay a premium for not having to mess with installation in general. However, it is worth bearing in mind, that depending on the choice of router/service, installation does vary from a simple 1 minute job on a graphical user interface, to picking/flashing firmware after extensive investigation etc.
Cheers!