There are sites such as classic sax online that have both the Rascher and the Caravan that will take returns after a 3 day trial. My experience is that Raschers are well suited to older saxes and they enrich the lower notes well. I use a Rascher on my Conn soprano and alto new wonder II. On my Tenor Conn New wonder II however I am more partial to the Caravan. So depending on the horn you may get different results. The differences I find is the Rascher has a more complex tone and a slightly richer low end on the older horns where as the Caravan seems less complex but even tonality through out the the horns range. My Alto Selmer MK VI wasn't as well served by the Caravan as it exposed the horns thin upper register, so I never spent the time working with it on that sax.