There are reviews on flashlightreviews.com and ledmuseum.org as well as a number of comments on this forum.
I had one... it is one of the very few lights I've ever lost. Though I love the looks of Inova products, I just can't get used to the basically zero spill of the X1. I like the durability of the lens, just wish it spilled a little bit. Some folks love the totally focused beam though.
For alternatives... I'm not really sure on a budget. I have a cheap little Browning Black Ice light that runs on three itty bitty batteries. I't squite a bit smaller than the Inova and only cost $7 I think. Also, for single AA lights, the Infinity Ultra (or Ultra G from countycomm.com) would be one of my top choices. Great runtime and very nice spill. Definately larger in diameter than the X1. Also, for a few more $$$, the AA lights from Peak might be worth looking into. My next one will be a McKinley (123a x 1) that drives 7 high power LEDs. More money, more expensive batteries, but would be much more usable for my uses than the X1. They also make a 5 LED version of their AA light. peakledsolutions.com for more info.
There are also the so-called Xnovas. Basically decent quality rip-offs of the Inova appearance. The smaller one uses a single AAA to drive three LEDs. The larger one uses a single AA to drive five LEDs. I've not owned either, but they get generally good comments. Ledmuseum.org has a review of the smaller one. I'd buy one of each.
The other issue for me is size... Smaller though not radically smaller than an X5T if you're going to pocket carry it. And I think it's too large for a keychain. Sounds like I'm knocking it, but I'm not. I've recommended them to several friends that want a economical, hi tech, smaller light and I'm sure there are much worse choices than the X1. And maybe (hopefully) you'll love yours. Lots of positive comments from other members.