To answer your question, YES, the 106 is far easier to work with and break down than SIP. SIP is a great polish but it has quite the learning curve. It can also get finicky with high humidity. You could polish with SIP on Monday and have great results. Then try it again on Tuesday and it skips all over the place and just won't behave like it did the day before. I would work with the 106 a bit before I picked up the SIP. If you can get the results you want with 106 then stay with that. It's easier to work with. Especially when starting out. That said, I wouldn't buy SIP if I were using a P/C. If money is an issue then buy a cheap Chicago Electric rotory for 30 bucks. Once you try a rotory, all these terms like polish breakdown and diminishing abrasives will happen right before your eyes and finally it will all come together for you. You won't burn anything with a rotory if you just go slow. I'm not sure you understand just how slow a rotory is capable of going. I learned how to use a rotory on my fifty three thousand dollar black corvette. Was I nervous? Absolutely. But I learned more about polishing in 30 minutes with a rotory than in 2 years of P/C. Today, a friend of mine asked me to detail his Tundra. It was loaded with minor scratches and paint transfers. What tool do you think I reached for Rotory or P/C???????
Patrick