I own an ix500 and a SV600 from Fujitsu. For the ix500, I still use the old 32bit software because it just works and because there seem to be wifi issues with the new software and the ix500. The ix500 is “connected” to my iMac. If I use the SV600, I use it in combination with my Macbook Pro.
Would I buy the ix500 today? No. Because if you want to go the Scansnap route, the new model (ix1500) has more options (display with some nice configuration options), it probably will be supported longer by Fujitsu, its price already has come down a bit (just checked and found it to be even cheaper than the ix500) and you get four licenses for the “nice” new software instead of only getting a single license.
If I had to buy a new scanner today, I would either go for the ix1500 or I would buy a Brother ADS-2800W (I use the Brother at work). The Brother scanner is able to scan without any software into my local network and from there I can do whatever I want, using Hazel and stuff like that. No restrictions whatsoever. If you scan weird paper formats or business cards or small receipts, the Fujitsu software is still worth it. If you scan standard paper sizes, I would lean more to a scanner like the Brother.
I do not think that there is a “one size fits all” answer to your question…
More details and very diverse opinions can be found in the numerous threads in the MPU forums.