Wheel Adapters ?? YA or Nay

I've had a set of bolt on spacers (same idea as adapters, just the same bolt pattern) for the past 6 months or so I think and they seem to have held up well. I've double checked them for tightness and few times and they never seem to have moved any. I got my set off of Ebay for around $60. I only have them on the front though. I would have tried to find rims to fit instead, but I was putting in a wider rear and couldn't find any wheels I liked that had the high backspacing I needed for the rear and the regular backspacing on the front in the same rim, at least not for a reasonable price.