Moving from SSL VPN to IPSec - Better clients than free forticlient?

Like a lot of you, I'm going to have to migrate a lot of users to IPSEC VPN which seems strange to me. IPSEC being so old I just assumed SSL VPN was the way to go. That aside, has anyone had experience with using different clients or the built-in windows client for connecting to a Fortigate IPSEC VPN? I have no experience with IPSEC clients beyond whatever the vendor provided (sonicwall global vpn anyone?) Would love to hear about your experience especially related to stability and ease of pushing out to users.