I contemplated websolr recently but went with IndexTank simply due to the free storage they provided. It's nice to test out the service in dev mode to see if it's a good fit before committing to paying for it. Any chance Websolr offers an option like this down the road?

Plus, Solr just seemed to struggle with geo search. I used Sunspot as my search interface and had to specify a minimum precision of 6 (supposedly a 6+ mile bounding box) to get any results, even those that were less than a mile away. I know Solr uses geohashing, but it just appeared wildly inaccurate...at least for me.