As with ALL products that are mass produced... they sometimes fail, which is a good enough reason for renting until you get your UKARA (min 56 days from your first game), that'll give you plenty time to decide if you like it & want to buy the gear you want.
If you're a mountain biker you'll already know how things go... start off with a lowish budget and more than double your investment on stuff that make the experience more enjoyable or simply guchi.
It's not a cheap hobby but could easily be done on any budget, you'll need to play 3 games at the same site, 2 within 56 days & 1 after 56 to get registered, once you have your UKARA you'll know if you want to continue & you'll have seen the kit others use (they may even let you try their pews), you'll easily learn what you like or don't like, most (but not all) are AR, AK, H&K based and are multi adaptable without any tech skills. Read the threads in these forums & drool over the pics and you'll pick up on any issues with makes or models of pews, some low budget items are cracking to use & some high end items are difficult to use consistantly but most are rewarding to use with regular cleaning & maintenance.
I personally started with a two tone Scar-L which cost me £159.99 and I used it in most games until I got my UKARA & went MAD with my budget.