Questions about SSL's

[markw10]

I currently am hosting my website on a hosting service that uses a basic RapidSSL certificate which we have been happy with.
We are moving our website to HostGator within a month and are currently going through the plans to sign up. They can transfer our RapidSSL certificate for us but also they offer Comodo SSL's with their plans for an extra cost. One is the positivessl (SSL Certificates from COMODO) which appears to be a basic SSL similar to our RapidSSL.
The other which I'm interested in is the instantlssl by Comodo (www.instantssl.com). This one would cost more but what we like is that it has $10,000 protection which the others listed above don't have and also it has a verification seal where if someone either clicks on or hovers their mouse pointer over it it verifies our identity, location, and address. It would only cost us around $3 extra a month for this SSL which would add all of these features.
Does anyone know much about Comodo. I know nothing about them so want to make sure that their SSL's are good. Thank you for any advice.
Also, one thing I have heard is RapidSSL is a single root certificate and InstantSSL by Comodo is not a a single root certificate but is a chained root install. I heard this can make it harder to install but my hosting service would install it for me so that's not a big issue.
The only issue is I have heard this can cause problems with mobile devices which are becoming so big now and can make it slower. Has anyone heard anything about this?