The pentatonic kalimba and the Alto kalimba are a great natural pairing. They can create a gorgeous contrast that works when two players can "jam with deliberate abandon" - meaning players who are technically proficient and can also really move, respond, and dance with each other's music. The pentatonic's basic traits contribute to the very attractive alliance it can make with the Alto.
The pentatonic kalimba is a bit of a mystery. It seems so simple - a perfect instrument for a beginner. Everything you play on it sounds great - playing it is a bit like finger painting - you just move your thumbs around and your movements somehow are transformed into beautiful sound. Which is probably why experienced players love jamming with the pentatonic kalimba! It represents freedom, and when you play it, you might very well feel as if you are flying.