Come over to Holland for a weekend in Amsterdam and drop by our rehearsal studio, I have a M2500 (USA) as my main bass.
It has a slimmer neck than my L2500, I do not like big necks and it feels very comfortable. That said, you have Ibbies so most necks will feel a little chunky in comparison perhaps.
Very flexible bass, great feel, great tone..... An L2500 in a suit, a bit more polite. Compared to the several Stingrays HH and HS 5-ers I owned I prefere the neck and tone of the M2500.
Thomann has a 30 day return policy.......