The Gulfstream 450 is part o the Gulfstream IV class of aircraft and includes the Gulfstream IV, Gulfstream IVSP, Gulfstream 450 and G400.  This class of aircraft was the predecessor to the GV and G550. Gulfstream just ceased production of the Gulfstream 450 with the final delivery being in Januray of 2018. Since this aircraft is no longer in production we would expect the prices of the used aircraft to fall significantly as the G500, the G450’s replacement starts being deleivered.  If you are looking for a G450 for sale you may want to wait to see how much of a correction there is to the used aircraft market before making a purchase.
The G450 is part of the GIV class of aircraft. The GIV was the successor to the GIII and was a significant step up in capability. The Gulfstream IV was the first business jet to have an entirely glass cockpit. It initially came with an electronic breaking system that was replaced by a hydraulic one in the GIVSP after some issues.  The aircraft are known for their toughness and have a very loyal following of both owners and pilots.
The GIV/G450 is replaced by the G500Â and the final G450 was delivered in January of 2018.
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