I haven''t used the IPD products yet I am glad to hear of such good reviews. I would also reccomend Lexol Leather Cleaner and Conditioner. That's some good stuff. Some tips on your Volvo:
1.) Don't EVER get wax on the vinyl body molding, it will not come off.
2.) Be careful with skin oil on the steering wheel, it can cause for the leather to actually rub off.
3.) For exterior products try http://www.zainobros.com/ these are the products that the manufacture's use at the big auto shows such as Frankfurt's and so forth. They have up to 12 step I believe.
4.) Also Volvo uses a 9 step paint process when your car was painted so it should last you a while. Since I work with reconditioning cars all day I know Volvo's are known for the quality of their upholstery and their paint process as well. have fun