Is it the F/5 or the F/8 version?
The biggest problem you will run into with a large ED refractor is halos around brighter stars. The F/5 will be considerably worse than the F/8 but even the F/8 will be really bad.
The larger the aperture the more difficult it is to control the CA. If you don't mind having the halos then by all means the 150ED will make you happy
