I had a pearl white M30 with brown top and leather interior before I bought the 240 vert. I hated that I sold it and when I was looking for another convertible I looked at both the M30 and the 240.
The M30 has a usable backseat if you have little kids, it's an Infiniti so it looks cool and is well made. the 3.0 litre engine is strong and reliable. They make 162 hp and all have auto trannys so it's not quite as much fun to drive. They all came with auto leveling suspension and a "Sport" and "Comfort" mode switch - that I could never tell any difference in.
The M30 will probably have better fit and finish on the inside as the trim was better made. A new top installed will be ~$1200 installed with rear window.
I really loved my M30 BUT with all that said the 240 still looks better, is funner to drive and gets many more looks than my M30 ever did. The M30 was based on the Stanza frame, not exactly all that exciting. Even my kids think the 240 looks "cooler."
So email me at
[email protected] if you have any specific comparison questions.
good luck!