Own VPN vs Paid VPN Services

Hey guys, I recently created my own VPN using a Raspberry Pi and this guide: http://www.raspberrypi.org/forums/viewtopic.php?t=81657

Is my VPN likely to be more or less secure than one I would pay for? I am mostly concerned about public WiFi that I use occasionally.

i have been curious about this myself. i recently set up openvpn on my pfsense box and wonder how well it works in relation to paid vpn services. especially on the mobile side