Unfortunate typo in title but I can vouch for scalr.
Used it since the early paid beta. Compared to the likes of rightscale it's a bargain. Alongside all the expected things like ami creation and cluster (aka farm) configuration the scripting features and automatic DNS management make life much easier. Their quality control used to be a bit hit and miss and it sometime felt like we were testing their functionality for them. I also had the impression their European DNS performance was poor (never validated). For the money though they were still a cost effective way of managing large ec2 clusters.
The open source version used to be a real pain to setup. Given the relative cost of setting up and running your own install I'd go with the paid version.
Used it since the early paid beta. Compared to the likes of rightscale it's a bargain. Alongside all the expected things like ami creation and cluster (aka farm) configuration the scripting features and automatic DNS management make life much easier. Their quality control used to be a bit hit and miss and it sometime felt like we were testing their functionality for them. I also had the impression their European DNS performance was poor (never validated). For the money though they were still a cost effective way of managing large ec2 clusters.
The open source version used to be a real pain to setup. Given the relative cost of setting up and running your own install I'd go with the paid version.