This isn't what you want to hear, but it might be what you need to hear. Save your money and save yourself months of cutting cut-rate tracks -- wait till you have the bucks to do it right.
If you're just going to cut one or two tracks per song with this sort of mic pre then by all means go ahead (if you buy from a store with a good return policy), but if you plan on tracking a lot with it, just be aware that you're going to get a build up of unpleasantness that's going to be just as much a pain to deal with as the sound you'll get not working with a pre at all.
Don't be fooled -- comparing them side by side on single instruments in the store doesn't tell you the story. Laying track after track and hearing the accumulated sound will indeed tell you the story.
It's hard advice, but sound advice. Buy tools that you're going to want to use further on down the road when your ears evolve -- that's not to be offensive; ALL our ears are evolving all the time if we're keeping up with this gig. A cheap pre, though it will have some limited uses it might work quite well for, will not be adequate to track main vox and guitars most of the time. A year down the road your ears are going to tell you this and you're not only going to have to pony up all the loot for a better pre at that time but you'll probably also have a year's worth of mediocre tracks to deal with.
If you're part of the way to a decent pre, be patient, exercise some discipline, and then get something you're going to use next year and the year after that as well.
You're building a toolkit. I know it's hard to be patient, but learning this lesson will -- in the long run -- save you money. Sorry to be the bearer of bad news, but this thought isn't new with me -- someone went to the trouble to spell it out for me, and though the advice didn't exactly make me happy, I've since come to recognize its value.
Cheers and good luck whatever you decide.