Infrant hasn't done anything earth-shattering with either the NV+ or 1100. Both represent minor tweaks of current products, with the more significant makeover done on the 1100 from the 1000S. And since at the heart of all ReadyNASes beats the RAIDiator firmware, you get the same feature set, no matter which model you choose.
The NV+ is a slight improvement over the NV, with most of the value coming in the Retrospect backup client bundle. Since both the NV and NV+ use the same processor and have the same memory, I suspect that the performance difference I saw is more due to better drives in the NV+ and newer firmware than anything else. So with the lowest price at time of review at $831 for a driveless NV+ and $517 for an NV, you might be better served by using the $300 to buy drives.
As for the 1100, I was surprised to see it consistently beaten by the NV+, even with the 1100's larger memory. But, once again, the NV+ drives with 16 MB of cache vs. the 1100 drives with 8 MB could be the deciding factor. But even if performance were equal, at slightly under $1000 for a driveless 1100, you have to really want or need the rack-mount form factor to justify the almost $500 premium over a naked NV.
Don't get me wrong. I still think that Infrant is one of the best overall RAID 5 "prosumer" NASes available, with a user interface and feature set that the other guys are still trying to catch up to. But competitors seem to be moving faster on performance improvement than Infrant, with Thecus especially focused on being the fastest. If Infrant wants to add that claim to its marketing collateral, it needs to get cracking.